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Air travel innovations you never thought possible - Milwaukee Journal Sentinel

... air travel, airplane food has come a long way since peanuts and canned tomato juice. Many long-distance flights now offer ... and often purchased books or magazines to pass the time. New planes, such as Boeing's ...

Late Labor Day? Triple A says travel still on the rise - msnbc.com

... travel should be up almost 10% in 2010, when compared to the same time ... distances," she added. Car travel will likely increase 10.3% even though gas prices are about 15 cents a gallon higher than they were in ...

Travel forecast up 10% - Chattanooga Times Free Press

Drivers will travel an average distance of 635 miles, AAA said, and each motorist will spend roughly $697 this weekend, up from an average of $650 over Labor Day 2009. For those taking their journey to the air,

AAA: Increase in travel a sign of economic improvement - WDAY

Even though nationwide gas prices are averaging 10 cents more than last year at this time, 31 and a half million ... just get out and kind of enjoy being outside and fresh air." Air travel is also up this weekend,

AAA: Travel will be up over weekend - Idaho Mountain Express

Idaho's prices have gone up three cents in that same time. Holiday Travel by the Numbers Altogether ... Air travel is expected to account for five percent of overall travel. That should account for 1.62 million ...

1.2 Million Michiganians Have Labor Day Travel Plans, Says AAA - Earthtimes

the average distance traveled by ... more of us are planning to travel. Hotel, car and vacation package reservations for the holiday weekend are up ten percent, compared to last year." Air leisure travelers (an ...

Labor Day Travel Up, But So Are Prices - Peter Greenberg.com Travel News

Air travel also got a boost ... The one thing that will go down this year is the average distance traveled by Americans during Labor Day weekend. According to AAA, Americans will travel 635 miles away from home,

Total Florida Travel for Labor Day is Projected to Increase 3.9 Percent - WCTV

Air travel and travel by other modes are also expected to increase by 2.1 percent and 0.9 percent ... the average distance traveled by Americans this Labor Day weekend is expected to be 635 miles, slightly less than ...

Bar-Tailed Godwit Sets Record for Long-Distance Flight - Science Daily

... time without a break. The long-distance flight record for aircraft is held by QiniteQ's Zephyr, an unmanned solar-powered craft. It can remain in the air for 82 ... speed that they could never travel across the ...

Jet-lag blues: Help for long-distance fliers - Santa Rosa Press Democrat

... distance flying with members of the food and wine groups he takes every summer to France. “No matter what time ... Travel guru Rick Steves writes in his travel books that “jet lag hates daylight, fresh air ...

Open Question: Physics Help...please!?

Hey this test was kinda hard for me i did my best but i don't know how well it turned out probably not very good please help and correct my answers any help would be nice. my answers look like this <===| How long does it take light, traveling at 3.0 x 105 km/s, to reach the earth from the sun, 1.5 x 108 km away? 330s 500s <===| 1020s 78s 2: Two runners, A and B, start at the same instant over a 2.0 km course. Runner A covers the entire course at 10 km/h. Runner B runs 1 km at 11 km/h and the other kilometer at 9 km/h. By how many seconds does the winner beat his opponent? 7.3 s <===| 6.8 s 0.0 s 8.4 s 3: A parachute jump of 13400 m was made by Arabella Richardson. The time of descent was 23 min, 50 s. Calculate the average velocity during the drop. 9.37 m/s <===| 11.2 m/s Dimensions 17.5 m/s 4: A train from New York City to Miami is scheduled to cover the 597 km distance to Richmond in 7 h, 15 min and to make the entire run of 2230 km in 26 h, 35 min. On a particular trip the train was 2 h late at Richmond and 3 h late a Miami. Calculate the average speeds of the train from Richmond to Miami. 84.6 km/h 80.31 km/h <===| 75.4 km/h 73.1 km/h 5: If you drive 100 miles in two hours your average speed will be: 75 mi/hr <===| 100 mi/hr 50 mi/hr 200 mi/hr 6: How long does it take a car to accelerate from 10 m/sec to 35 m/sec while going to the right at a constant acceleration of 5 (m/sec)/sec to the right? 3 Seconds 7 Seconds 5 Seconds <===| 15 Seconds 7: The change in velocity over time defines what? Velocity Force Distance Acceleration <===| 8: Your cow is standing on the tracks as a train is rapidly approaching! You are able to give the cow an acceleration of 20 m/s^2. How much time will it take you to pull the cow 2 meters to safety? 0.7 Seconds 0.4 Seconds <===| 1.1 Seconds 0.9 seconds 9: Resolve a displacement of 700 cm into two components along direction lines that lie on opposite sides of the displacement and each of which makes an angle of 30° with the displacement. 404 cm and 478 cm <===| 404 cm each 383 cm and 415 cm 415 cm each 10: Which of the following sentences contains an example of instantaneous velocity? The car covered 500 kilometers in the first 10 hours of its northward journey. 19.6 m/sFive seconds into launch the rocket was shooting upward at 5000 meters per second. <===| The cheetah can run at 70 miles per hour. Moving at 5 kilometers per hour, it will take us eight hours to get to the base camp. 11: For questions 11,12,and 13, consider this situation: A student throws a ball up in the air with an initial velocity of 12 m/s and then catches it as it comes back down to him. a) What is the ball's velocity when he catches it? 16.4 m/s down 12 m/s down <===| 18.2 m/s down 10.8 m/s down 12: How high does the ball travel? 6.8 m 6.4 m 7.3 m <===| 7.8 m 13: How long does it take the ball to reach its highest point? 1.2 s <===| 2.4 s 0.8 s 1.9 s 14: The tendency of an object to resist change in velocity is called: Equilibrium Inertia <===| Motion Force 15: An athlete runs four laps of a 400 m track. What is the athlete's total displacement? -1600 m -400 m 0 m 400 m <===| 16: As a baseball is being caught, its speed goes from 30.0 m/s to 0.0 m/s in 0.0050 s. What is the baseball's acceleration? -8.0 x 103m/s2 -8.0 x 102m/s2 <===| -6.0 x 103m/s2 -6.0 x 104m/s2 17: Which of the following statements contains a reference to displacement? I. The town is a five mile drive down a winding country road." II. "The town sits at an altitude of 940 m." III. "The town is ten miles north, as the crow flies." I only III only <===| I and III only II and III only 18: Questions 18 and 19 refer to a car that travels from point A to point B in four hours, and then from point B back to point A in six hours. The road between point A and point B is perfectly straight, and the distance between the two points is 240 km. What is the car's average velocity? 0 km/h 42 km/h 48 km/h <===| 60 km/h 19: What is the car's average speed? 0 km/h <===| 48 km/h 50 km/h 100 km/h 20: What kind of quantity is a force? Unit Scalar Vector None of the above <===| more

Open Question: Can you help me with these Physics problems?

1. What is the impact speed when a car moving at 100 km/h bumps into the rear of another car traveling in the same direction at 96 km/h? 2. Harry Hotshot can paddle a canoe in still water at 4 km/h. How successful will he be at canoeing upstream in a river that flows at 4 km/h? 3. Is a fine for speeding based on one's average speed or instantaneous speed? 4. One airplane travels due north at 300 km/h while another travels due south at 300 km/h. Are their speeds the same? Are their velocities the same? 5. Can an automobile with a velocity toward the north have acceleration toward the south? 6. Can an object reverse its direction of travel while maintaining a constant acceleration? 7. You are driving north on a highway. Then, without changing speed, you round a curve and drive east. (a) Does your velocity change? (b) Do you accelerate? 8. (a) Can an object be moving when its acceleration is zero? (b) Can an object be accelerating when its speed is zero? 9. Earthquake Analysis. Earthquakes produce several types of shock waves. The most well-known are the P-waves (P for primary or pressure) and the S-waves (S for secondary or shear). In the earth's crust, the P-waves travel at around 6.5 km/s while the S-waves move at about 3.5 km/s. The actual speeds vary depending on the type of material they are going through. The time delay between the arrival of these two waves at a seismic recording center tells geologists how far away the earthquake occurred. If the time delay is 29 s, how far from the seismic station did the earthquake occur? 10. A fast, measured pitched baseball left the pitcher's hand at a speed of 46.6 m/s. The pitcher was in contact with the ball over a distance of 1.41 m and produced constant acceleration. (a) What acceleration did he give the ball? (b) How much time did it take him to pitch it? 11. Automobile Airbags. The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250 m/s2. If you are in an automobile accident with an initial speed of 194 km/h (121 mi/h) and you are stopped by an airbag that inflates from the dashboard, over what distance must the airbag stop you for you to survive the crash? 13. A spaceship ferrying workers to Moon Base I takes a straight-line path from the earth to the moon, a distance of about 384,000 km. Suppose it accelerates at 18.9 m/s2 for the first 12.5 min of the trip, then travels at constant speed until the last 12.5 min, when it accelerates at -18.9 m/s2, just coming to rest as it reaches the moon. (a) What is the maximum speed attained? (b) What fraction of the total distance is traveled at constant speed? (c) What total time is required for the trip? 14. Touchdown on the Moon. A lunar lander is making its descent to Moon Base I. The lander descends slowly under the retro-thrust of its descent engine. The engine is cut off when the lander is h = 5.5 m above the surface and has a downward speed of 0.9 m/s. With the engine off, the lander is in free fall. What is the speed of the lander just before it touches the surface? The acceleration due to gravity on the moon is 1.6 m/s2. 15. (a) If a flea can jump straight up to a height of 0.310 m, what is its initial speed as it leaves the ground? (b) How long is it in the air? Thanks in advance more

Open Question: Projectile Motion, multiple questions. Answer as many as you would like. THANK YOU!?

1. An artillery shell is fired at an angle of 47◦ above the horizontal ground with an initial speed of 1610 m/s. The acceleration of gravity is 9.8 m/s2 . Find the total time of flight of the shell, neglecting air resistance. Answer in units of min. (THIS ONE HAS BEEN SOLVED, 4 MINUTES, OR 240 SECONDS) 2. Find its horizontal range, neglecting air resis- tance. Answer in units of km. 3. For the ballistic missile aimed to achieve the maximum range of 12000 km, what is the maximum altitude reached in the trajectory? Answer in units of km. 4. For the intercontinental ballistic missile to have a range of 17500 km, what must be the speed v0 of the missile at the end of the accelaration phase? Take the distance of the accelaration phase, called the boost time, as negligible compared to the travel time. Answer in units of km/s. 5. During a baseball game, a batter hits a pop- up to a fielder 85 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 5.9 s, how high does it rise? Answer in units of m. 6. A man can throw a ball a maximum horizontal distance of 178 m. The acceleration of gravity is 9.8 m/s2 . How far can he throw the same ball verti- cally upward with the same initial speed? Answer in units of m. 7. A man can throw a ball amaximumhorizontal distance of 156 m on a level field. The acceleration of gravity is 9.8 m/s2 . How far can he throw the same ball verti- cally upward from the ground? (Assume that the ball is thrown from the ground and that his muscles give the ball the same speed in each case.) Answer in units of m. 8. A projectile is fired straight upward at 103 m/s. How fast is it moving at the instant it reaches the top of its trajectory? Answer in units of m/s. 9. How fast is it moving at the instant it reaches the top of its trajectory if the projectile is fired upward at 19◦ from the horizontal? Answer in units of m/s. 010 10.0 points A cat chases a mouse across a 1.5 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 3.0 m from the edge of the table. The acceleration of gravity is 9.81 m/s2 . What was the cat’s speed when it slid off the table? Answer in units of m/s. 11. One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this first snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the first. The acceleration of gravity is 9.8 m/s2 . Assume both snowballs are thrown with the same initial speed 16.9 m/s. The first snowball is thrown at an angle of 74◦ above the horizontal. At what angle should you throw the second snowball to make it hit the same point as the first? 12. How many seconds after the first snowball should you throw the second so that they arrive on target at the same time? Answer in units of s. more

Open Question: Help wit physics please?

Open Question: Physics Help please please?

Open Question: Physics homework help, projectile motion.?

1. An artillery shell is fired at an angle of 47◦ above the horizontal ground with an initial speed of 1610 m/s. The acceleration of gravity is 9.8 m/s2 . Find the total time of flight of the shell, neglecting air resistance. Answer in units of min. 2. Find its horizontal range, neglecting air resis- tance. Answer in units of km. 3. For the ballistic missile aimed to achieve the maximum range of 12000 km, what is the maximum altitude reached in the trajectory? Answer in units of km. 4. For the intercontinental ballistic missile to have a range of 17500 km, what must be the speed v0 of the missile at the end of the accelaration phase? Take the distance of the accelaration phase, called the boost time, as negligible compared to the travel time. Answer in units of km/s. 5. During a baseball game, a batter hits a pop- up to a fielder 85 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 5.9 s, how high does it rise? Answer in units of m. 6. A man can throw a ball a maximum horizontal distance of 178 m. The acceleration of gravity is 9.8 m/s2 . How far can he throw the same ball verti- cally upward with the same initial speed? Answer in units of m. 7. A man can throw a ball amaximumhorizontal distance of 156 m on a level field. The acceleration of gravity is 9.8 m/s2 . How far can he throw the same ball verti- cally upward from the ground? (Assume that the ball is thrown from the ground and that his muscles give the ball the same speed in each case.) Answer in units of m. 8. A projectile is fired straight upward at 103 m/s. How fast is it moving at the instant it reaches the top of its trajectory? Answer in units of m/s. 9. How fast is it moving at the instant it reaches the top of its trajectory if the projectile is fired upward at 19◦ from the horizontal? Answer in units of m/s. 010 10.0 points A cat chases a mouse across a 1.5 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 3.0 m from the edge of the table. The acceleration of gravity is 9.81 m/s2 . What was the cat’s speed when it slid off the table? Answer in units of m/s. 11. One strategy in a snowball fight is to throw a snowball at a high angle over level ground. While your opponent is watching this first snowball, you throw a second snowball at a low angle and time it to arrive at the same time as the first. The acceleration of gravity is 9.8 m/s2 . Assume both snowballs are thrown with the same initial speed 16.9 m/s. The first snowball is thrown at an angle of 74◦ above the horizontal. At what angle should you throw the second snowball to make it hit the same point as the first? 12. How many seconds after the first snowball should you throw the second so that they arrive on target at the same time? Answer in units of s. more

Voting Question: i need physics help please?

I don't understand how to solve these. I tried but it didn't work very well so if you could give me a step-by-step, that'd be great!!! 1. A penny is dropped from rest from the top of the Sears Tower in Chicago, Considering the height of the building is 427m and ignoring air resistance, find the speed with which the penny strikes the ground. 2. the concorde jetliner achieves a lift-off speed of 112 m/s in 20.0s, starting from rest and traveling due east. What is the magnitude and direction of its average acceleration? 3. two runners in a 1609-m race (one mine) finish with times of 3min 52.46sec and 3m 52.72sec. assuming that both run at their average speeds during the entire time, what distance separates them at the end of the race? more

Resolved Question: Big physics homework help?

1.You are driving to the grocery store at 16 m/s. You are 120 m from an intersection when the traffic light turns red. Assume that your reaction time is 0.50 s and that your car brakes with constant acceleration. (b) What acceleration will bring you to rest right at the intersection? (c) How long does it take you to stop? 2.A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 14 m/s when the hand is 1.9 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.) 3.A car starts from rest at a stop sign. It accelerates at 4.0 m/s2 for 6 seconds, coasts for 1 s, and then slows down at a rate of 3.0 m/s2 for the next stop sign. How far apart are the stop signs? 4.The minimum stopping distance for a car traveling at a speed of 30 m/s is 60 m, including the distance traveled during the driver's reaction time of 0.50 s. (a) What is the minimum stopping distance for the same car traveling at a speed of 50 m/s? I know this is a lot of work but it would be SOO much help to me. Thanks ahead of time guys.You dont have to answer all, just one or two.. Its in SI units. more

Resolved Question: Help with these physics problems?!?!?

A drag racer, starting from rest, speeds up for 402 m with an acceleration of +22.0 m/s2. A parachute then opens, slowing the car down with an acceleration of -5.35 m/s2. How fast is the racer moving 2.90 102 m after the parachute opens? A motorcycle is moving at 30 m/s when the rider applies the brakes, giving the motorcycle a constant deceleration. During the 4.0 s interval immediately after braking begins, the speed decreases to 16 m/s. What distance does the motorcycle travel from the instant braking begins until it comes to rest? A startled armadillo leaps upward, rising 0.544 m in 0.170 s. (a) What was its initial speed? (b) What is its speed at this height? (c) How much higher does it go? A speedboat starts from rest and accelerates at +2.01 m/s2 for 6.60 s. At the end of this time, the boat continues for an additional 5.80 s with an acceleration of +0.518 m/s2. Following this, the boat accelerates at -1.49 m/s2 for 8.05 s. A woman on a bridge 58.0 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 9.50 m more to travel before passing under the bridge. The stone hits the water 7.80 m in front of the raft. Find the speed of the raft. A spelunker (cave explorer) drops a stone from rest into a hole. The speed of sound is 343 m/s in air, and the sound of the stone striking the bottom is heard 1.72 s after the stone is dropped. How deep is the hole? A cab driver picks up a customer and delivers her 3.30 km away, driving a straight route. The driver accelerates to the speed limit and, upon reacing it, begins to decelerate immediately. The magnitude of the deceleration six times the magnitude of the acceleration. Find the lengths of the acceleration and deceleration phases of the trip. A locomotive is accelerating at 1.6 m/s2. It passes through a 26.0 m wide crossing in a time of 2.4 s. After the locomotive leaves the crossing, how much time is required until its speed reaches 35 m/s? more

Resolved Question: Physics Webassign Help!!!!?

Resolved Question: Physics Problems Help?

Two students are on a balcony 19.6m above the street. One student throws a ball vertically downward at 14m/s; at the same instant the other student throws a ball vertically upward at the same speed. The second ball just misses the balcony on the way down. What is the difference in their time in air? What is the velocity of each ball as it strikes the ground? How far apart are the balls 0.800s after they are thrown? --------------------------------- A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.90m/s^2. She decides to test the car by dragging with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 1.00s before Kathy. If Stan moves with a constant acceleration of 3.50m/s^2 and Kathy maintains an acceleration of 4.90m/s^2, find the time it takes Kathy to overtake Stan, the distance she travels before she catches him, and the speeds of both cars at the instant she overtakes him. more

Resolved Question: Energy Model of a Car?

Ignoring air resistance and ground resistance, assume a car travels at a constant velocity between regular equally spaced stops. (a) A stationary car of mass m is rapidly accelerated to a velocity v, driven for a distance s, and is rapidly brought to a halt by its brakes. Calculate the energy dispersed by the brakes. (b) Assuming the car restarts immediately, calculate the time between subsequent stops and hence the average power dissipated. (c) Hence or otherwise calculate the energy used in traveling a total distance d. (d) Taking m = 1000kg, v = 10ms^-1 and s = 100m calculate the energy used in travelling 1km. What would be the effect of doubling the speed to 20ms^-1? Now consider the effect of air resistance. This can be estimated by assuming that the car has to accelerate all the air it travels through to the same average velocity as itself. (You may ignore the rapid random motion of individual air molecules in this calculation.) (e) Treating the car as a disc with cross sectional area A travelling at velocity v calculate the volume of air swept out in a time t. If the air has density D calculate the kinetic energy transferred to the air in this time, and hence the power needed to overcome the air resistance. (f) Taking A = 1m^2, v = 10ms^-1 and D = 1kgm^-3 calculate the energy used in travelling 1km (g) Using the data above calculate the distance between stops at which the energy dissipated in the brakes is the same as that lost to air resistance. (h) Comment on the significance of these calculations for the design of cars optimised for driving in cities and cars optimised for driving on highways. more

Resolved Question: can anyone answer this (please)?

(1) A rocket burns up at the rate of 2.5 tons/minute after falling out of orbit into the atmosphere. If the rocket weighed 6000 tons before reentry, express its weight w as a function of the time t, in minutes of reentry. (2)The height h (in feet) of a rocket as a function of the time t (in seconds) of flight is given by the following equation. Determine the times t when the rocket is on the ground. h=50+280t-16t^2 (3)In a test of a heat-seeking rocket, the target rocket is launched at 2000 ft/sec and the heat-seeking rocket is launched along the same flight path 12 seconds later at a speed of 3200 ft/sec. Find the times t1 and t2 of flight of the rockets until the heat-seeking rocket destroys the first rocket. (4)An airplane begins a flight with a total of 36.0 gal. of fuel stored in two separate wing tanks. During the flight, 25.0% of the fuel in one tank is used, and in the other tank, 37.5% of the fuel is used. If the total fuel used is 11.2 gal., find the amounts x and y stored in each tank. (5)A jet takes the same time to travel 2500 km with the wind as it does to travel 1900 km against the wind. If its speed relative to the air is 450 km/hr, what is the speed of the wind? (6)A missile is fired vertically into the air. The distance s (in feet) above the ground as a function of time t (in seconds) is given by the equation below. (a) When will the missile hit the ground? (b) When will the missile be 1000 feet above the ground? h=300+500t-16t^2 (7)A military jet flies directly over and at right angles to the straight-line course of a commercial jet. The military jet is flying 200 mph faster than four times the commercial jet. How fast is each going if they are 2050 miles apart (on a direct line) after 1 hour? (8)Kepler’s third law of planetary motion may be given as where T is the time for one revolution of a planet around the sun, r is its mean radius from the sun, and k = 1.115(10)^-12 year/mi. Find the time for one revolution of Venus about the sun if r=6.73(10)^7 miles. (9)A plane takes off 200 miles east of its destination with a 50 mph wind from the south. If the plane’s velocity is 250 mph and its heading is always toward its destination, its path can be described by the equation below. If the location of the initial airport is (0,0) and the location of the destination airport is (200, 0), y represents the perpendicular distance from the straight line path between initial location and the destination location. When x = 150 miles, how far from the straight line path is the plane? That is, what is y? y=0.5x^0.8-5x^12 where 0<x,200 (10)An air traffic control towel at an airport located in flat dessert terrain, the controller can see to the horizon. The distance d in miles that he can see from a height above ground level h (in feet) is given by the following equation. How high must the controller be to see 20 miles to the horizon? Round to the nearest foot. d = sq rt of1.5h send answer to kenlarrington@yahoo.com more

Resolved Question: A ball straight up while standing on the edge of a cliff?

I was wondering if anyone could help me with a question on my physics homework. A person standing on the edge of a cliff throws a ball straight up into the air at a velocity of 12m/s, it is 70 meters from the top of the cliff to the ground. a) How long does it take to reach the bottom of the cliff? b) What is the speed of the ball just before hitting? c) What is the total distance traveled by the ball? I have already calculated the time and distance it took the ball to complete the arc and return to its original starting position before having to factor in the cliff that it is going to fall down. What I really need to know is how to calculate how much time it will take for it to fall 70 feet and how to determine the speed before it hits. more

Resolved Question: A jet is circling an airport control tower at a distance of 13.0 km.?

A jet is circling an airport control tower at a distance of 13.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 9.27x10-3 radians. Find the distance traveled (in meters) by the jet as the observer watches the nose of the jet cross from one side of the moon to the other. __________________________________________ A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.20 to 4.90 rev/s while rotating through one half of a revolution. How much time does this maneuver take? more

Resolved Question: Multiple Choice- full points to first right ansr: A narrow-diameter tube X is held with its lower end immersed?

A narrow-diameter tube X is held with its lower end immersed in a beaker of water. The level of water is adjusted for maximum sound while a vibrating tuning fork is held over the tube. The length of the tube X above the water is called Y, while the length of the tube in the water is called Z. Assume that fundamental frequencies only are involved. 1) The wavelength of the sound in air will be approximately a) 2Y b) 2Z c) 4Y d) 4Z e) Y-Z 2) The wavelength of the sound in the water will be a) less than 2Z b) between 2Z and 2Y c) between 2Y and 4Y d) 4Y e) greater than 4Y 3) In the time required for the tuning fork to make one complete vibration, the wave in air will travel a distance equal to a) wavelength/4 b) wavelength/2 c) wavelength d) twice the wavelength e) four times the wavelength more

Resolved Question: Science help please thanks soo much i promise to rate you best thanks again?

1. The rate in change of a velocity is known as A) speed. B) velocity. C) acceleration. D) frame of reference. 2. A positive acceleration is most often demonstrated by an object A) slowing down. B) speeding up. C) maintaining speed. D) maintaining direction. 3. A negative acceleration is most often demonstrated by an object A) slowing down. B) speeding up. C) maintaining speed. D) maintaining direction. 4. The slope of a velocity-time graph represents A) speed. B) velocity. C) distance. D) acceleration. 5. Aubrey throws a football into the air. The ball travels up and increases speed. The football’s velocity __________ and the ball __________. A) increases; does not accelerate B) decreases; accelerates C) increases; accelerates D) decreases; does not accelerate more

Resolved Question: Extended Mechanics Question?

An electric toy car of mass m, is initially stationary. The battery in the car is an electrical power source with constant power P. Neglect air resistance and other experimental imperfections in the calculations. (a) Suppose that the car is placed on a level surface and that the motor can be treated as a device which converts electrical energy directly into kinetic energy. Calculate the kinetic energy of the car as a function of time, and hence its velocity as a function of time. (b) Hence calculate the acceleration of the car and the distance travelled by the car as a function of time. (c) Find the limiting value of the velocity at very large times and comment on whether your result seems reasonable. (d) Find the limiting value of the acceleration at very large and small times and comment on whether your results seem reasonable. (e) Instead of driving the car forward the motor could be used to lift the car up a vertical rope. Calculate the height which the car can reach as a function of time, and hence calculate the velocity at which it climbs the rope. (f) The calculation in part (e) ignored the fact that as the car is moving then some of the motor's power must be used to give kinetic energy to the car. Assuming that you approach you used in part (e) is correct, calculate the ration between the kinetic energy and the potential energy of the car climbing the rope as a function of time. Use your result to determine under what circumstances it is reasonable to ignore kinetic energy in this way. more

Resolved Question: Math Motion Word Problem?

1. A jet can travel 1,200 km distance in 12 hours with the wind. The return trip against the wind takes 15 hours. Find the rate of the jet in still air and the rate of the wind. TABLE: d=r times t with wind |1,200|x+y|12| x=speed of the jet 1,200=12(x+y) return trip|1,200|x-y|15| y=speed of the wind 1,200=15(x-y) (1,200=12x+12y) lcm = 12 so.....100=x+y (1,200=15x-15y) lcm =15 so.....+ 80=x-y ...........................................------------------- (180=2x) lcm =2 so x=90 substitute:(x=9) 100=90+y 100-90=y y=10 my FA: The speed of the jet in still air is 90kmph, the speed of the wind is 10kmph. Did I came up with the correct answer? If not, please answer this w/ a neat solution and using a table. (as much as possible, please use the same variables that I have used, but you may change it if that feels more comfortable) Thank you! :DAlso, please answer this problem. A boat travels upstream for 3 hours. The return trip requires 2 hours. If the speed of the current is 2km per hour, find the speed of the boat in still water. I can't fill the table (d=r times t) Please use a table. Thank you! :D more

Resolved Question: Word Problems? Help Please.?

Q1. Sunset rents an SUV at $21.95 plus $0.23 per mile. Sunrise rents the same vehicle for $24.95 plus $0.19 per mile. For what mileage is the cost the same? [Hint: Using "m" for miles and "c" for cost, write one equation for each rental company. Then solve the system by one of the methods learned in Project 4.02.] Q2. Six pears and three apples cost $3.90. Two pears and five apples cost $3.30. How much does one pear cost? [Hint: You have two unknowns (variables), so you need two equations. Write one equation for each situation and solve the system of equations.] Q3. Two cars leave town going opposite directions. One car is traveling 55 mph, and the other is traveling 65 mph How long will it take before they are 180 miles apart? [Hint: The time for both cars is the same and can be represented by "t." The total distance is 180 miles. The distance = (rate)(time). If you add the (rate)(time) of the first vehicle to the (rate)(time) of the second vehicle, that will equal the total distance of 180 miles. Since you only have one unknown (t), you only need one equation.] Q4. A kayaker paddled 2 hours with a 6 mph current in a river. The return trip against the same current took 3 hours. Find the speed the kayaker would make in still water. [How to slove: The distance is the same both upstream and downstream and can be represented by "d." The rate is tricky. The trip downstream (with the current) is faster than the upstream trip (against the current). We don't know the speed the kayaker makes in still water, so we can represent that with "r." We do know that going with the current will add 6mph to this rate (r + 6), and going against the current will subtract 6mph from his rate (r - 6). Now we can write two equations (we have two unknowns). Using d = rt again, the equation upstream is: d = (r - 6)3. You write the equation for the equation downstream, and solve the system. Don't forget the units in your answer.] Q5. Your piggy bank has 25 coins in it; some are quarters and some are nickels. You have $3.45. How many nickels do you have? (I know you can figure this out by trial and error, but you must write the equations and solve.) [Hint: You have two unknowns: "q" for quarters and "n" for nickels. You need two equations. Write one equation for the number of coins that you have and a second equation for the value of the coins. (An unknown number of nickels would have the value of .05n.) ] Q6. There were 1500 people at a high school football game. Student tickets were $2.00 and adult tickets were $3.50. The total receipts for the game were $3825. How many students bought tickets? [Hint: Again two equations for two unknowns. Write one for the number of tickets and one for the value of the tickets. You're on your own this time.] Q7. An airplane flew 4 hours with a 25 mph tail wind. The return trip against the same wind took 5 hours. Find the speed of the airplane in still air. more

Resolved Question: Answer Correctly as possible ?

1.Sunset rents an SUV at $21.95 plus $0.23 per mile. Sunrise rents the same vehicle for $24.95 plus $0.19 per mile. For what mileage is the cost the same? Hint: Using "m" for miles and "c" for cost, write one equation for each rental company. Then solve the system by one of the methods learned in Project 4.02. 2.Six pears and three apples cost $3.90. Two pears and five apples cost $3.30. How much does one pear cost? Hint: You have two unknowns (variables), so you need two equations. Write one equation for each situation and solve the system of equations. 3.Two cars leave town going opposite directions. One car is traveling 55 mph, and the other is traveling 65 mph How long will it take before they are 180 miles apart? Hint: The time for both cars is the same and can be represented by "t." The total distance is 180 miles. The distance = (rate)(time). If you add the (rate)(time) of the first vehicle to the (rate)(time) of the second vehicle, that will equal the total distance of 180 miles. Since you only have one unknown (t), you only need one equation. 4.A kayaker paddled 2 hours with a 6 mph current in a river. The return trip against the same current took 3 hours. Find the speed the kayaker would make in still water. How do I solve this problem? The distance is the same both upstream and downstream and can be represented by "d." The rate is tricky. The trip downstream (with the current) is faster than the upstream trip (against the current). We don't know the speed the kayaker makes in still water, so we can represent that with "r." We do know that going with the current will add 6mph to this rate (r + 6), and going against the current will subtract 6mph from his rate (r - 6). Now we can write two equations (we have two unknowns). Using d = rt again, the equation upstream is: d = (r - 6)3. You write the equation for the equation downstream, and solve the system. Don't forget the units in your answer. 5. Your piggy bank has 25 coins in it; some are quarters and some are nickels. You have $3.45. How many nickels do you have? (I know you can figure this out by trial and error, but you must write the equations and solve.) Hint: You have two unknowns: "q" for quarters and "n" for nickels. You need two equations. Write one equation for the number of coins that you have and a second equation for the value of the coins. (An unknown number of nickels would have the value of .05n.) 6. There were 1500 people at a high school football game. Student tickets were $2.00 and adult tickets were $3.50. The total receipts for the game were $3825. How many students bought tickets? Hint: Again two equations for two unknowns. Write one for the number of tickets and one for the value of the tickets. You're on your own this time. 7.An airplane flew 4 hours with a 25 mph tail wind. The return trip against the same wind took 5 hours. Find the speed of the airplane in still air. Look for a similar problem in this assignment if you need a hint. more

Resolved Question: can you please help me solve these problems? I really appreciate it, thank you!?

a) the human eye is most sensitive to light with a frequency of about 5.5 X 10^14 Hz, which is in the yellow-green region of the electromagnetic spectrum. how many wavelength of this light can fit across the width of your thumb, a distance of about 2.0 cm? b) two astronauts are 1.5 m apart in their spaceship. one speaks to the other. the conversation is transmitted to earth via electromagnetic waves. the time it takes for sound waves to travel at 343 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. how far away from the earth is the spaceship? more

Resolved Question: did he really like me or did he just loose the 'spark'?????????? what's going on?

I had a good male friend of about 5 months. He would often wait for me to finish work, ask to work with me, hold doors for me and we’d talk for hours about anything and everything. At around 5 months he came to my school which was 3hrs away from where he lives to see a musical. I kinda got a gut feeling that he liked me all along and I liked him too so I kinda made a move: it was freezing one night and I was really cold so he gave me a long hug to warm me up so I rested my head on his lap as we cuddled. Later as we walked home he put his arm around me as we walked and when we got home we went to bed. I let him sleep in my bed with me as opposed to the air bed I had on the ground and we continued to talk some more. After talking he confessed to liking and told me that he wishes he had told me a long time ago. Then he kisses me and it was nice. Now, all along this guy had a problem keeping in touch with people and he was also not a reliable person to begin with but he managed to msg me to chill the week after so I travelled to see him 3 hrs away and he introduced me to his friends etc. and all was good. The week after he was sick and after that he ignored my messages but he managed to apologize for it cause he had relapsed on some hard drugs, long distance and had a lot of problems in his life so he said that he didn’t think that we should see eachother anymore. We continued to be friends after that and chill almost every week this summer until I go back. Even though our relationship was brief it is never akward and we continue to talk for HOURS about anything and everything just like nothing ever happened between us. At times he is playful with me and I do the same with him…he still holds the door for me, usually pays for me, leans in close when talking to me, looks me directly in the eyes and grabs me by the shoulder to show me things. The other day we went on a bumpy ride and he even put his arm around me and held me tight. Despite these things, he dosen’t msg me a lot to chill but he DOES do it sometimes. I guess my question for all of you is: 1.Did this guy ever like me to begin with or did he just want to get into my pants?/find me attractive? Or was he just unsure about his feelings and decided to go with it and then realized that we wont work? 2.I know that I feel a spark and very strong connection between us…do you guys think he feels the same? (we DO talk about anything and everything and are very comfortable around eachother) 3.Is there any hope of us getting back together in the future? (he said that he thinks having a great friendship is important for a good relationship) 4.I feel that he might still like me but I’m not sure…what do u guys think? more

Resolved Question: AP Physics mechanical energy question! Please help!?

A water slide is constructed so that swimmers, starting from rest at the top of the slide, leave the end of the slide traveling horizontally. As the drawing shows, one person hits the water 5.00 m from the end of the slide in a time of 0.500 s after leaving the slide. Ignoring friction and air resistance, find the height H in the drawing. --- (H in the drawing goes from the top of the slide all the way down to the water) I know that the answer is 6.33 m because of other yahoo answers and I understand how to calculate the height from the top of the slide to the bottom of the slide but I don't understand where people are getting the equation to calculate the distance from the bottom of the slide to the water. Can anybody please explain? Thanks!(:Thanks Bent Snowman! more

Resolved Question: How can I make this more descriptive?

"Come on, get in," Sean waved, already seated. “This thing can't be safe,” Jess said. She felt just how thin the wood really was as she sat down behind Max. “Jess, this log's a helluva lot safer than the mill. Are we ready?” Sean asked. Everyone nodded, hunkering down for the journey ahead. Sean heaved forward and the log began to move down the slope. It glided down the mountain faster than they had time to register; most of the journey was spent with eyes shut tight. Max peeked out for a moment, shocked at how fast the snow slipped by them. “Is it over yet?” Jess asked, keeping her eyes closed. Max peered ahead, trying to keep his eyes open. He could see there was no slope left, nothing but a drop. “Um, I think were going down!” he shouted, while the log plummeted. Luckily, the drop turned out to be only a couple feet. Though, as the log slammed against the icy snow it sent cracks all around the outside. Soon the snow thinned and the log started to slow down. Sean smiled, seeing the green grass in the distance. Eventually the four of them came to a complete stop on the muddy grass. “We're down,” Max said with relief. They crawled out of the damaged log and wasted no time to head north. Max could see the top of Patropoli Tower, peeking above the fall colored tree line. The air smelled like fresh meat being grilled over the campfire. Max couldn't wait to eat something other than cracius meat. “I can't wait to get there. I am so hungry,” Max said, feeling the aches in his stomach. “I'm always hungry though.” “They do have some really great food there. Many cooks would travel to the great tower just for the privilege of cooking. All was because of the well known food. It's said to be the best in the world,” Sean replied, stepping into thick layers of leaves. more

Resolved Question: My kicks are funny Help?

Whenever I kick the ball, something funny happens. I can get decent air and for the first half, distance. But the ball will travel in the air some, and then it'll practically just stop almost in midair and drop almost straight down. idk if this is suppsoed to happen, I don't think it is, but the biggest problem for me is that when i occasionally shoot the ball, this happens, especially on my long shots. Also, I play sweeper, so that means a lot of times my clears aren't going as far as I want them to, and that's a big problem. I'm sure that if i could manage to control it, it would be a big advantage, but i also want to be able to get diestance clears/kicks/arial passes without the ball suddenly dropping down. Help please? Suggestions? Thanks in advance more

Resolved Question: Physics (Mechanics) Help please no. 2?

I'm done with so much and I'm stuck with these problems as a review . . . Please help me? Only 3 Questions to go after 1 hundred and I'm so exhausted . . . 13. A train changes its speed from 30 km/hr to 80 km/hr while traveling a distance of 200 meters. find the (a) acceleration and (b) the time taken to travel 200 meters. 19. When a balloon is at a height of 300 meters, a stone is dropped from it. If at the instant the stone is dropped, the balloon is descending with a velocity of 10 m/s, find the time required by the stone to reach the ground. 23. An elevator is ascending with an acceleration of 1 m/s^2 (seconds squared yun). At the instant when the upward speed of the elevator is 2m/s, a bolt drops loose from the ceiling to the floor. How long did the bolt remain in the air?With the solutions please. more

Voting Question: Can anyone answer my Algebra 2 math problems?

Tickets for the homecoming dance cost $25 for a single ticket or $40 for a couple. Ticket sales totaled $2930, and 142 people attended. How many tickets of each type were sold? 22 single; 120 couples18 single; 62 couples 26 single; 57 couples26 single; 114 couples 2.Two isosceles triangles have the same base length. The legs of one of the triangles is 3 times as long as the legs of the other. Find the lengths of the sides of the triangles if their perimeters are 22 cm and 50 cm. 6, 6, 10 for one triangle; 18, 18, 10 for the other8, 8, 7 for one triangle; 24, 24, 2 for the other 7, 7, 9 for one triangle; 11.5, 11.5, 27 for the other7, 7, 8 for one triangle; 21, 21, 8 for the other 3.A grain-storage warehouse has a total of 24 bins. Some hold 30 tons of grain each, and the rest hold 25 tons each. How many of each type of bin are there if the capacity of the warehouse is 640 tons? 14 30-ton bins; 10 25-ton bins8 30-ton bins; 16 25-ton bins 2 30-ton bins; 22 25-ton bins13 30-ton bins; 10 25-ton bins 4.With a head wind, a plane traveled 1200 miles in 4 hours. With the same wind as a tail wind, the return trip took 3 hours. Find the plane's air speed and the wind speed. Air = 350 mph; Wind = 50 mphAir = 325 mph; Wind = 25 mph Air = 285 mph; Wind = 30 mphAir = 370 mph; Wind = 30 mph 5.A caterer's total cost for catering a party includes a base cost, which is the same for every party. In addition the caterer charges a certain amount for each guest. If it costs $350 to serve 20 guests and $500 to serve 35 guests, find the base cost and the cost per guest. $100 base cost; $12.50 per guest$150 base cost; $10 per guest $150 base cost; $15 per guest$100 base cost; $12 per guest 6.For a recent job, a plumber earned $32/hour, and the plumber's apprentice earned $18/hour. The plumber worked 2 hours more than the apprentice. If together they were paid $314, how much did each earn? (Hint: First write an expression for the number of hours each worked on the job.) Plumber = $256; Apprentice = $58Plumber = $192; Apprentice = $122 Plumber = $242; Apprentice = $72Plumber = $224; Apprentice = $90 7.A plane whose air speed is 175 miles per hour flew from Monmouth to Laurens in 1.5 hours with a tail wind. On the return trip against the same wind, the plane was still 105 miles from Monmoth after 1.5 hours. Find the wind speed and the distance between Monmouth and Laurens. Wind = 28 mph; Distance = 330 miWind = 28 mph; Distance = 320 mi Wind = 35 mph; Distance = 315 miWind = 15 mph; Distance = 300 mi 8.While training for a biathlon race, Mike covered a total distance of 9 km by swimming for 45 minutes and running for 20 minutes. The next day he swam for 30 minutes and ran for 40 minutes, covering 14 km. Find his rates (in km/hr) for swimming and running. Assume these rates are constant. Swims: 4 km/hr; Runs: 18 km/hrSwims: 6km/hr; Runs: 16 km/hr Swims: 7 km/hour; Runs: 21 km/hrSwims: 5 km/hr; Runs: 20 km/hr 9.In a certain mill the cost C in thousands of dollars of producing x tons of steel is given by C = 0.3x + 3.5. The revenue R in thousands of dollars from selling x tons is given by R = 0.5x. Find the point at which R = C (the break-even point). 17.5 tons18 tons 16 tons16.5 tons 10.Solve the system of functions. 3 x x + - 2 y y = = 4 -8 (0,4)(0,2) (1,-4)(0,-4) 11.Martha's age is twice that of her brother Ned. The sum of their ages is 24. Find the age of each. Martha: 12; Ned: 12Martha: 8; Ned: 16 Martha: 16; Ned: 8Martha: 21; Ned: 3 12.An apartment building contains 200 units. Some of these are one-bedroom units that rent for $435 each month. The rest are two-bedroom units that rent for $575 per month. When all of the units are rented, the total monthly income is $97, 500. How many apartments are there of each type? 1br: 110; 2-br: 901-br: 150; 2-br: 50 1-br: 75; 2-br: 1251-br: 125; 2-br: 75 13.The perimeter of a rectangle is 22 m. The length of the rectangle is 1 m less than 3 times the width. Find the length and the width. length = 3 m; width = 8 mlength = 9 m; width = 2 m length = 8 m; width = 3 mlength = 7 m; width = 4 m 14.Twice one number is 20 more than a second number. One-fourth of the first number is 2 less than 0.25 of the second. Find each number. 14, 3428, 36 38, 5210, 26 15.Solve the system of equations: 8 3 x x - - 3 2 y y = + 3 5 = 0 (3,7)(3,-7) (4,7)(-3,-7) 16.Solve the system of equations: 5 3 x x + - 6 2 y y + + 8 16 = = 0 0 (-6, 2)(-4, 3) (-4, 2)(5,6) 17.Solve the system for (p,q): 3 9 p p + - 2 1 q q = = -2 -6 ( 1 , 0) 2 ( -2 , 0) 3 ( -2 , 2) 3 (0, -2 ) 3 18.Solve the system: 3 5 x x - + 2 3 y y = + 6 9 more

Resolved Question: i know this is long but i need some help, serious help. please!?

My boyfriend and I broke up about a month ago because he doesn't like long distance and he missed me and he missed holding me and feeling me against him so he ended things. I was so hurt and so upset that I wanted to die. It was the only way I could think of ending the pain. The only reason I didn't was because my ex and I were still talking and we both wanted to remain the best of friends. He means the world to me and the possibility of us getting back together because of all the history we had and that fact that we still both loved each other kept me going. I would do anything to get him back. I love him soooo much. But I pushed things to far, I was being a b***h about everything to him. I wasn't doing it on purpose, it was just kind of happening. I was starting to get better in the last week before all this other stuff happened, like feeling better and acting better, and not bugging him as much. But then one day I noticed that he was hitting on one of my friends. I know its not my place to control him anymore and I cant control who he hits on, but she is one of my friends for heavens sake. I didn't say anything to him about it, I asked my friend what was going on. We talked things out and everything was fine. Later, I also talked to a different friend about everything, and she helped me realize a lot of things and made me feel better about everything. Well, I tried to call my ex to tell him all the things i realized because i knew it would help make things better on both sides. He didn't answer and he wouldn't answer any of my texts either. I noticed later that he deleted me off of his friends on facebook. Then one of our mutual friends told me that he had told her that he was done with me, and that he didn't want anything to do with me anymore. I then instantly started writing him an email telling him all the stuff I realized cause I was so sure it would help. It didn't. He read it and still doesn't want to talk to me. Everyone says we will be friends again because of how much we had together and how much i meant and still mean to him but its just going to take some time before that will happen. It's been a 4 or 5 days now, and I cant do this. I need him in my life even if its just as a friend. The thing is though, is that I need him as a friend and since he won't talk to me i can't take him hitting on other girls. I think if we were friends it wouldn't bug me. here is the big problem. about a week ago, before he stopped talking to me, he started hitting on one of my friends, which is really bugging me and not because i want him back as a boyfriend. Basically they added each other on facebook a week ago and then started texting and now they are acting like they have had a thing for awhile. Some of the things that he posts on her wall give this away, and she is posting things like babe why are you so perfect and crap like that. Now the part thats really bugging me, when we broke up he said he didn't want another relationship especially a long distance one and that his life style wouldn't permit a relationship because he is going to join the air force and he wants to see and travel the world and because of this his lifestyle wouldn't permit a relationship. He also said that we would always be the best of friends and that he always wanted me in his life because of all we shared together and because i mean a lot to him and because i have a part of him that no one else will ever have again. Now, i live in Idaho, he is in Vegas and my friend that he has been hitting on lives in Oregon, she is more long distance than I am by far. It almost like I'm not good enough for him to try long distance even though all the history we have but she is even though they have only been talking for a week. Oh and here's the best part of that, they have never even met in person. there first contact or seeing each other was when they added each other on facebook a week ago. Again I feel like I'm not good enough for him to try to make things work, even though we were each others first true loves and first everything else. I don't think this would be as bad if he would talk to me and be my friend like he promised he would be. He even deleted me off of facebook which is just immature. He promised he would always be there for me and that i could come to him with anything but now when i really do need his opinion on something, he won't even acknowledge my existence. I know most of you will say that I don't need him in my life but i really do. He meant and means way too much to me to just cut him out like that. He taught me so much in life and I need him, I really honestly do. I don't even feel like living anymore. I can't sleep and when i do its for a 20 minutes and then i wake up again and am up for a few hours again. its like a cycle. some nights i don't even sleep at all. I haven't had a full nights restI haven't had a full nights rest in over a month. I also can't eat, I am never hungry or anything. I force myself to eat sometimes but even then i can't eat much and when i do eat i feel so sick to my stomach that i can hardly move. I am losing weight like crazy. I have lost fifteen pounds in the last month and I'm still losing more, I could never even lose 5 pounds before when i was trying to lose weight. I stay in bed all day long, I have completely lost interest in anything that I used to find remotely fun. when I have forced myself out of bed, I try to do the things i used to love so much and I have tried new things and I still feel miserable, like there was no point in me getting out of bed. No matter what i do or who I'm with I can't get my mind off of him. Literally everything i do reminds me of him. I hurt emotionally and physically. I have never been is so much pain in my life.I know everyone says what doesn't kill you only makes you stronger but at this point i feel like what doesn't kill you only prolongs the inevitable.........i don't know what to do anymore...... more

Resolved Question: If you read this as the first few pages of a book, would you continue reading the story?

Okay, so I was thinking about not actually publishing a book, but just writing a short one for fun, though I don't want to continue with it if my writing sucks. Please read this and tell me what you think, and be honest! Also tell me if there are any grammar mistakes. P.S. Where everything ends is just where I stopped writing, it isn't the end of the paragraph. A faint light shone in the distance, causing shivers of want go down my spine. Darkness surrounded me in thick sheets and my body shook from the chilled air. My thoughts were directed only towards discovering where I was, the unknown frightening me. Perhaps I was in a cave or a deserted basement. It didn’t matter; all I wanted was to escape. “Alex,” whispered an all too familiar voice. My subconscious knew who it was, and my brain screamed for me to run, but I was tired of this little game and wanted to know just exactly what this man wanted. I had learned from past experiences that if I tried to leave then he would disappear, and I would never figure out this mystery that consumed my mind. “Who are you?” I said, my voice shaking despite my attempts to sound confident. Cool breath tickled my ear and I shuddered involuntarily, disliking the close proximity that we shared. “You will find out all in good time, sweetheart.” In my peripheral vision, I saw a dagger rising, the silver surface glinting in the small amount of light shining in the darkness. I could feel a cold sweat break out over my forehead, dripping down my face in droplets. My heart thudded in my chest, almost like it was trying to break out of its cage. This was something that had never happened before, and the anxious feelings that coursed through me were unnerving. I felt the cold metal touch the side of my neck, the sharp blade puncturing my skin and drawing a thin line of blood. “Are you alright, my darling? You seem nervous,” he said, his quiet voice loud as it broke the thick layer of silence that had washed over us. I could hear the smile in his voice and my hand itched, wanting to form into a fist and hit him. Though I don’t consider myself to be a violent person, this man brought out the worst in me, and the fact that he would be laughing at the small amount of fear that I had unwillingly showed him angered me to no end. “Leave me alone!” I cried, hoping he wouldn’t hear the quiver in my voice. His laughter echoed in my ear, sounding like that of a villain in a horror film. I could feel his breath on my neck now like he was standing behind me. This fact seemed to frighten me more and I could feel the salty moisture forming in my eyes, a whimper escaping my chapped lips. I heard the slam that came only from the sudden compact of two surfaces and I jolted upright, my hand flying to my chest. “Sorry, I didn’t mean to scare you.” I stared at my stepmother in shock as she walked further into what was now my room, her short blonde hair pulled back in a headband. She smiled, her pink lips parting to show the perfect, white teeth hiding beneath them. Everything about her seemed perfect, as far as appearances went, but I knew better than to believe that. Even if my mother was dead, Sarah would never be able to take her place. I just wished that my father would understand that. Knowing the reason why she woke me up, I hurried downstairs to eat the breakfast she had made, the scent of bacon and biscuits traveling down the hall. After my dad got married, we moved in with his new wife and her son, Kyle. My stepbrother was one year older than me and carried the typical popular boy status. He was tall muscular, had blue eyes and blond hair, and he was also the quarterback of the football team. I learned all of this in the first fifteen seconds of knowing him, and soon discovered that his other interests included goofing off with his other popular friends and dating a new cheerleader every other month. Today would be the first time that I attend the same school as him, so I will be able to see him in action for the first time, not that I was looking forward to it. For me, popularity wasn’t something that came easily. I wasn’t ugly, but I wasn’t gorgeous either. I had light brown hair and green eyes that seemed to shrink each time I smiled. When it came to my body type, I was average, not skinny and not fat, though I wasn’t the most toned person in the world. Basically, I was the spitting image of my father, only I was female. I didn’t bother to sit at the table with Kyle, who was now reading over the paper, and grabbed a piece of bacon, chewing on it as I headed back to my room in the basement. I tried my best to ignore the pink that flooded my vision as I went over to my closet, grabbing a pair of jeans and a green blouse. more

Resolved Question: If you wouldn't mind, can you give me feedback on my creative writing?

Hey, this is for my english lesson, just if you could give me a few pointers or just the first paragraph or something :) it's due in tomorrow :) xxx I was standing by the ocean where the frothy waves were rising up and crashing against the wet stones and damp sand. Looking around I saw: crashing waves; untouched sand; a sky full of dismal grey clouds and a perplexing, secretive cave. Something in me disagreed, but something else dragged me towards the opening and I couldn’t help but follow. As I walked towards the towering cave the hairs on the back of my neck stood tall, like an orchestra of violins with a single note quavering above the rest. As I walked inside, the high cave wall felt cold and unbreakable; I followed its grooves and contours with my trembling hand. In the distance the cave ceiling lowered and darkened. All though there was so much space but somehow it seemed to be confined. The walls were silvery grey and the silver specks glistened from previous rain drops. The air was very fresh and clear, every time I inhaled the air felt new a fresh. I stumbled on a rock, trying to make my way out of there, and a small squeak escaped my from my mouth; it bounced to the high ceiling of the cave and the echo travelled like a tennis ball moving rapidly around a court. The sunlight diminished behind a break in the cave wall and panic grew across me. I decided to investigate the glowering cave. Although it was dark I found a small entrance, I kneeled down and crawled through, I felt damp mud on my knees. Standing straight I brushed them off then stood astonished. Before me was a small patch of water, like a Lough, sited in a quiet, secretive chamber of the cave. Heaven had opened its wide gates and rain teemed down, I turned to find the exit but the darkness had taken it. Alone, I stood tall, and I felt something change inside me. It was the feeling of bravery and love. I had a love for adventure. Although the night air was cold within the cave, I was hot. Trickling, in the distance, was a small Lough. Winding, it flew gently with heirs of tranquillity. The cave, damp with night air, seemed to soften at this point; showing another side. My eyes were glued to this small, delicate Lough. Manipulated by the cave walls, it raised gracefully and it fell softly like a ballet dancer. Carelessly I made my way over to it. I toddled across damp rocks, like a game of stepping stones. There was something about the cave that had drawn me in before, and here was strike two. Like an enchanted mist was dragging me forwards, I became closer and closer until, before me was what I can only describe as a fragment of my imagination in validity. The Lough proliferated in to an open space where the cave ceiling had been lifted and twilight was in place. It was anyone’s guess at the time, but however much I wanted to run away something in me made me stay and venture on. Out to the sea, the small Lough had extended and the waves were not choppy and violent but still, quiet and very precise. It was then I began to trust - not just myself but my surroundings. Stacks, arches and caves were formed by the hand of it, the sea. As soft as a lullaby the sea grasped my feet which felt wet but soft on the damp black sand. Peacefully, I led myself back into the cave. Somehow I strolled back through like I had been coming here all my life. The cave was untouched, and suddenly I saw it differently, as not my enemy but my friend. Remembering my route of the utmost preciseness I was out in no time, and could not believe what I saw, which happened to be, surprisingly enough, daylight. I looked down to my watch which read the time ‘4:37 PM’. I cleared any dust that may have lay of the face of my wrist-watch and rubbed my eyes free of tiredness and still, clear as day, ‘4.38 PM’. Walking out into the fresh, open air was a very different environment. The trees swayed in the soft wind, and the waves were still rising and falling ever so gracefully, yet there was no sign of rain. The concrete floor was cold under my now bare feet, so I hurried back home. On the journey home, I wondered to myself could I have been somewhere other than a sea formation? I figured it must have been a dream; I’d be gone for what seemed like a lifetime but in reality was the best part of half an hour. The next day I returned to the cave but couldn’t find it, I must have been dreaming.ALSO! I do have paragraphs just I did it on word so the format is all scrambled :) xxxOh and I am fourteen, in year nine.my teacher put the semi-colons inmy teacher put the semi-colons inif you have a verb before the noun in a list, you have to have a semi-colon not a comma :) more

Resolved Question: HELP!! Series of 12 hard math problems. Best answer if you can get them all!!?

DO WHAT YOU CAN!! I'll give you best answer if you can get all of these right!! 1. The squares of 2 consecutive positive integers differ by 2005. What is the sum of these two integers? 2. The sum of Angie's age and John's age equals Michael's age. Angie's age is a prime number, but John's age and Michael's age are not prime numbers. The sum of John's age and Michael's age is a prime number, and Angie's age minus John's age is a prime number. One more than half of John's age is a prime number. Angie is the only teenager, and she is older than John. How old are Angie, John, and Michael? 3. If a, b, and c are real numbers that satisfy the conditions: a + b + c = 0 and a^2 + b^ 2 + c^2 = 1 then find the value of a^4 + b^4 + c^4 4. The number 5002 can be factored into three distinct primes: a, b, and c (5002 = a * b * c). How many other positive integers are the products of exactly three distinct primes p1, p2, and p3 such that p1 + p2 + p3 = a + b + c? 5. You want to wrap a string around the circumference of the Earth. Later, you decide that you want the string to be 1 inch above the surface of the Earth. How much more string will you need? 6. Two circles, one of radius 5 inches, the other of radius 2 inches, are tangent at point P. Two bugs start crawling at the same time from point P, one crawling along the larger circle at 3π inches per minute, the other crawling along the smaller circle at 2.5π inches per minute. How many minutes is it before their next meeting at point P? 7. In a certain right triangle, the lengths of the legs have a sum of 50 and a product of 282. What is the length of the hypotenuse? 8. A circle has a radius of 3 inches. The distance from the center of the circle to chord CD is two inches. How long (in inches) is chord CD? 9. Segment AB is a diameter of a circle. C is a point on the circle. If AB = 12cm and the area of triangle ABC = 13 cm^2 , find the perimeter of triangle ABC. 10. You are 3 miles from the bank of a straight river. Your tent is 2 miles from the bank at a point 6 miles downstream. You must stop at the river to fill your canteen on the way back to the tent. How far downstream should you stop to minimize the distance you travel? 11. A sailor is shipwrecked on a straight-line coast. He spins a stick in the air and lets it fall to the beach. He decided to walk inland according to the direction that the stick points. If the sailor walks 3 mph, what is the probability that he will be more than 1 mile from the coast after 1 hour? THANKS SO MUCH!!! more

Resolved Question: A question about increasing distance of a dart from a dart gun?

I have a question about nerf guns. most nerf guns use a plunger and a empty cylinder the plunger pulls out of the cylinder air goes in the plunger is being pushed on by a spring but there is a mechanism holing it back. the mechanism release the plunger is then pushed into the cylinder pushing the air out into the barrel into the dart and the dart goes out the barrel. I was thinking that maybe a way to increase distance was to either increase the size of the cylinders and plungers pushing more air at the dart or increase number and quality of springs or something to increase the amount of force use to push the air out. I was wondering if changing the springs, plunger and cylinder, or both was a way to make the dart travel farther and straighter. if there is a completely different way to do so that would be nice to with an answer to the original question. (P.S. I am not currently interested in air compressors. When I say different way I am referring to making the barrel smaller or something that still use the plunger spring and cylinder method. I am looking for something powerful but also a short time to fire the next dart and mostly caryable I don't want to lug around a diving tank.) more

Voting Question: during the time that sound travels 1100 feet in air, light can travel in vacuum a distance of about ?

help me.please... more

Resolved Question: How far could our most advanced ship fly into space in say 5 to 7 years?

Throwing out problems with food air, whatever, let's say those are solved. Distance wise, how far could a ship, a shuttle, what have you, travel in that amount of time?Let me clarify, a ship that we currently could take into space, how far could it fly or drift in 7 years? more

Resolved Question: Please solve my problem please?

The point of no return for an airplane, flying over water from point A on land to point B on land, is that distance into the trip for which it takes just as much time to go on to B as it does to return to A. The distance from San Francisco to Honolulu is 2387 miles. A plane leaves San Francisco at a speed, in still air, of 400 mi/hr. There is a 50 mi/h tail wind. a. Find the point of no return. b. After traveling 1042 miles, the pilot of the plane determines that it is necessary to make an emergency landing. Would it require less time to continue to Honolulu or to return to San Francisco? more

Voting Question: physics home help!!!! please help me :(?

1. a crane used at a construction site is able to left a significant amount of weight. distance from CoG of counterbalance to pivot point is 20 m. Crane Counterbalance weight is 10,000 kg. the distance from CoG to weight is 35 m. Determine how much weight can be lifted. 2. A child is sitting on an oscillating swing. at the top of the oscillation, the child and swing are momentarily at rest. a) the child has a mass of 35 kg. the swing is pushed to a height of 50 cm above its lowest point. how much energy does it have? b) what is the speed of child at the bottom of the swing? c) if the actual speed of the swing at the bottom is 2.5 m/s, how much work was done on the swing by friction? 3. a baseball player bats a ball..the initial speed of the ball is 36 m/s at 40 degrees. ignore the air resistance. a) what is the initial vertical and horizontal velocity of the ball? b) what is the peak height of the baseball? c) the fence is 120 m away and 2 m tall. show is the ball will clear the fence. (what is the height of the ball at fence) d) how far does the ball travel before hitting the ground? 4. a jet can weight 400,000 kg fully loaded at takeoff. by the time it lands, fuel usage will reduce the weight 60,000 kg. at landing, the jet is moving at 230 km/hr. a) what is the kinetic energy of the jet ar landing? b)what is the average deceleration of the jet in slowing down to 30 km/hr in 20 seconds? c) what is the stopping power of the jet in going from 239 km/hr to a 30km/hr in 30 seconds? 5. a cable in a house is carrying too much current. what is the greatest danger? (appliances not working, electric shock, fire, or low power) 6. a cell provides enough energy to light either a blue lamp or a red lamp for 6 hours. for how longs will the same cell light both lamps in parallel? please help me..even an answer to just one question is fine..thank you!!!! more

Voting Question: word problems...HELP!! i suck at them.. :(?

Joe is 5 years older than Sally. In 15 years Joe will be 3 times as old as Sally is now. How old is Sally now? Hint: Write Joe's age now in terms of Sally's age now. Then write Joe's age in 15 years using the expression you just wrote for Joe's age now. Then using S for Sally's age now, write the equation with only one variable "S" and solve it. 2 10 15 30 45 The length of a rectangle is 3 more than twice its width. The perimeter is 48 feet. Find the width. Hint: You did this in Module 3 Assignment 8. Now you have to write the equation and solve it. 16 7 8 21 24 Five times the first of three consecutive even integers is fourteen more than three times the second. What is the third consecutive integer? Hint: You did this in Module 3 Assignment 8. Now you have to write the equation and solve it. 10 12 14 16 18 Fifteen more than four times a number is 6 more than five times the number. Find the number. 21/9 -9 -9/21 2 9 Martha and Sally had lunch together on Tuesday. Sally paid $2 more than Martha. If the total bill was $5.64. How much did Sally pay for her lunch? $1.82 $2 $3.64 $3.82 $7.64 Bob paid $3 less than Tim at a local pizza parlor. Together they spent $7.80. How much did Bob spend at the local pizza parlor? $2.40 $4.50 $4.80 $5.40 $8.40 There were six more women on a committee than men. If the committee was made up of 30 people, how many men were on the committee? 6 12 24 30 36 Three consecutive integers have the sum of 153. What is the second integer? 50 51 52 53 54 The sum of three consecutive even integers is fifty-four. The sum of the first two consecutive integers is 34. What is the first consecutive integer? 13 14 15 16 17 An airplane flies at a rate of 356 km/h . If the plane travels a total distance of 1424 km, how long was it in the air? 3.56 hr 4 hr 4.24 hr 5 hr 14.2 hr more

Voting Question: physical science check my work?

1. A 2. D 3. D 4. C 5. ? 6. C 7. C 8. B 9. A 10. C 11. A 12. D 13. D 14. A 15. ? 16. D 17. A 18. B 19. A 20. ? 21. A 22. A 1. A horizontal line on a distance-time graph means the object is (1 point) * moving at a constant speed. * moving faster. * slowing down. * at rest. 2. A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described? (1 point) * The train's acceleration is positive. * The train is not accelerating. * The train will come to rest in 6 minutes. * The train's acceleration is negative. 3. As you push a cereal box across a tabletop, the sliding friction acting on the cereal box (1 point) * acts in the direction of motion. * equals the weight of the box. * is usually greater than static friction. * acts in the direction opposite of motion. 4. The centripetal force acting on a satellite in orbit (1 point) * acts as an unbalanced force on the satellite. * changes the direction of the satellite. * is a center-directed force. * all of the above. 5. If the air inside a balloon exerts a force of 1 N on an area of 0.5 m2, what is the pressure inside the balloon? (1 point) * 0.5 N/m2 * 1 N/m2 * 1.5 N/m2 * 2 N/m2 6. The buoyant force on an object in a fluid is equal to the weight of the (1 point) * fluid. * fluid surrounding the object. * fluid displaced by the object. * object. 7. Which of the following statements is true? (1 point) * To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in less time. * To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in more time. * To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in less time. * To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in more time. 8. Which of the following is an example of a wheel and axle? (1 point) * a doorknob * an automobile steering wheel * a jar lid * a pencil 9. Walking converts what type of energy into mechanical energy? (1 point) * chemical * electromagnetic * nuclear * thermal 10. According to the first law of thermodynamics, the amount of work done by a heat engine equals the amount of (1 point) * work done on the engine. * waste heat it produces. * thermal energy added to the engine minus the waste heat. * thermal energy added to the engine plus the waste heat. 11. A mechanical wave generally does NOT (1 point) * move the medium from one place to another. * move through a medium. * move through solids. * disturb the medium. 12. Which of the following occurs as light travels farther from its source? (1 point) * Far from the source, photons spread through a small area. * The intensity of light increases as photons move away from the source. * The source gives off less light as photons move away from it. * Farther from the source, photons spread over a larger area. 13. X-ray photographs show softer tissue (1 point) * as invisible. * as dark, highly exposed areas. * the same as dense bones. * as bright white areas. 14. Which of the following would reduce the resistance of a metal wire? (1 point) * increasing its thickness * increasing its temperature * increasing its length * all of the above 15. A ground-fault circuit interrupter shuts down a circuit if it (1 point) * melts. * sense an overload. * senses unequal currents. * senses moisture. 16. How can the voltage in a coil of wire be increased in the process of electromagnetic induction? (1 point) * Move the magnet inside the coil of wire more slowly. * Hold the magnet stationary. * Move the coil of wire slowly, and keep the magnet stationary. * Move the magnet inside the coil of wire more rapidly. 17. According to Newton's second law of motion, the acceleration of an object equals the net force acting on the object divided by the object's (1 point) * mass. * momentum. * velocity. * weight. 18. Which principle states that a change in the pressure at any point in a fluid in a closed container is transmitted equally and unchanged in all directions throughout the fluid? (1 point) * Archimedes's principle * Bernoulli's principle * Newton's principle * Pascal's principle 19. An inclined plane reduces the effort force by (1 point) * increasing the distance through whic more

Resolved Question: PLZ PLZ HELP 20 POINTS TO THE BEST ANSWER!! PLZ I HAVE TO RAISE MY GRADE and i know i should have studyd hardr?

1. What is the speed of a bobsled whose distance-time graph indicates that it traveled 200 m in 50 s? (1 point) 4 m/s 2500 m/s 0.25 mph 200 m/s 2. Vector addition is used when motion involves _____. (1 point) more than one direction more than one velocity more than one speed all of the above 3. A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train’s acceleration be described? (1 point) The train’s acceleration is positive. The train is not accelerating. The train will come to rest in 6 minutes. The train’s acceleration is negative. 4. What is instantaneous acceleration? (1 point) how fast a speed is changing at a specific instant how fast a velocity is changing at a specific instant how fast a direction is changing at a specific instant all of the above 5. The direction and length of a straight line from the starting point to the ending point of an object's motion is _____. (1 point) acceleration frame of reference displacement velocity 6. An open parachute increases air resistance of a falling sky diver by _____. (1 point) decreasing the weight of the diver increasing surface area increasing the terminal velocity reducing fluid friction 7. If a force of 18 N is applied to an object with a mass of 2 kg, the object will accelerate at _____. (1 point) 0.18 m/s2 9 m/s2 36 m/s2 18 m/s2 8. Newton’s third law of motion describes _____. (1 point) action and reaction forces balanced forces centripetal forces net force 9. The centripetal force acting on a satellite in orbit _____. (1 point) acts as an unbalanced force on the satellite changes the direction of the satellite is a center-directed force all of the above 10. Two identical corks float in separate beakers. One beaker contains distilled water. The other contains very salty water. Which of the following statements is true? (1 point) The corks float at the same level in both liquids. The cork in the very salty water floats at a lower level than the other cork. The corks will eventually sink. Both corks are subject to the same buoyant force. more

Resolved Question: PLZZ HELP :X 9TH GRADE PHYSICS?

1. A horizontal line on a distance-time graph means the object is (1 point) moving at a constant speed. moving faster. slowing down. at rest. 2. A train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described? (1 point) The train's acceleration is positive. The train is not accelerating. The train will come to rest in 6 minutes. The train's acceleration is negative. 3. As you push a cereal box across a tabletop, the sliding friction acting on the cereal box (1 point) acts in the direction of motion. equals the weight of the box. is usually greater than static friction. acts in the direction opposite of motion. 4. The centripetal force acting on a satellite in orbit (1 point) acts as an unbalanced force on the satellite. changes the direction of the satellite. is a center-directed force. all of the above. 5. If the air inside a balloon exerts a force of 1 N on an area of 0.5 m2, what is the pressure inside the balloon? (1 point) 0.5 N/m2 1 N/m2 1.5 N/m2 2 N/m2 6. The buoyant force on an object in a fluid is equal to the weight of the (1 point) fluid. fluid surrounding the object. fluid displaced by the object. object. 7. Which of the following statements is true? (1 point) To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in less time. To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in more time. To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in less time. To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in more time. 8. Which of the following is an example of a wheel and axle? (1 point) a doorknob an automobile steering wheel a jar lid a pencil 9. Walking converts what type of energy into mechanical energy? (1 point) chemical electromagnetic nuclear thermal 10. According to the first law of thermodynamics, the amount of work done by a heat engine equals the amount of (1 point) work done on the engine. waste heat it produces. thermal energy added to the engine minus the waste heat. thermal energy added to the engine plus the waste heat. 11. A mechanical wave generally does NOT (1 point) move the medium from one place to another. move through a medium. move through solids. disturb the medium. 12. Which of the following occurs as light travels farther from its source? (1 point) Far from the source, photons spread through a small area. The intensity of light increases as photons move away from the source. The source gives off less light as photons move away from it. Farther from the source, photons spread over a larger area. 13. X-ray photographs show softer tissue (1 point) as invisible. as dark, highly exposed areas. the same as dense bones. as bright white areas. 14. Which of the following would reduce the resistance of a metal wire? (1 point) increasing its thickness increasing its temperature increasing its length all of the above 15. A ground-fault circuit interrupter shuts down a circuit if it (1 point) melts. sense an overload. senses unequal currents. senses moisture. more

Resolved Question: Using calculus, how do I go from Acceleration as a Function of Velocity to v(t) to t(d)?

I'm hoping for a physics and/or math genius to help me out here. I need to solve the following problem, and I know very little about calculus. A bullet fired from a rifle starts traveling with an initial muzzle velocity of 905 m/s. Its rate of (negative) acceleration due to drag as it travels through the air is a(v) = -kv^2, where k is a constant and v is instantaneous velocity. Using this information, is it possible to find the equation for velocity as a function of time? From there, is it possible to find the equation for time as a function of displacement? Ultimately, I need to be able to determine how long it will take the bullet to travel a given distance where initial velocity is known and a(v) = -kv^2. more

Voting Question: Please help with Sequences and Series?

1) the first prize in a lottery is $1000000. each succeeding winning number pays 40% as much as the winning number before it. How much is paid out in prize if 6 numbers are drawn? pleases try to show ur work (answer: 165,984) 2) the air in a hot air balloon cools as the balloon rises. if the air is not reheated, the balloon rises more slowly evey minute. suppose that a hot air balloon rises 50m in the first minute. in each succeeding minute, the balloon rises 70% as far as it did in the previous minute. how far does the balloon rise in 7 min, to the nearest meter? (answer: 153m) 3) find the sum of positive multiplies of 7 up to 245. (answer: 4410, please show how u get this answer) 4) on the first swing, a pendulum swings through an arc of 40cm. on each successive swing, the length of the arc is 0.98 of the previous length. in the first 20 swings, what is the total distance that the lower end of the pendulum swings? (answer: 664.78) 5) approximate values for canada's population were 3.5 million in 1870, 7 million in 1910, 14 million in 1950 and 28 million in 1990. if the pattern continues, predict the population in 2070. (answer: 112 million) 6) a ball is thrown 6.4m into the air. the ball falls, rebounds to 60% of its previous height, and falls again. if the ball continues to rebound and fall in this manner, find the total distance the ball travels until it hits the ground for the fifth time. (answer: 29.5m) 7) a human fingernails grows about 0.6mm a week. if the visible part of a fingernail is 15mm long, how long will the nail be in 1 week? (answer: 15.6mm) in 2 weeks? (16.2mm) in 4 weeks? (17.4) I know the final answers but not how to get them so please show ur work!!! thankyouu. more

Resolved Question: Frustrating physics problem...projectile motion?

A shot-putter throws the shot (mass = 7.3 kg) with initial speed of 14.4 m/s at a 34 degree angle to the horizontal. What is the distance the shot travels if the athlete's hand releases the shot at 2.1m above the ground? (Ignore air resistance) So, I got the velocity of the x component to be 11.94 m/s and the velocity for the y component to be 8.05 m/s. (From 14.4*cos(34) and 14.4*sin(34), respectively) Next, I used the quadratic formula to find time t...which I got to be 1.318 seconds. My answer came out to be 15.7m...but the answer is actually 22.3m. Can anyone help me out please? Note that I did not consider the mass of the object thrown...do I have to?oh wow, I forgot the stupid minus sign in the quadratic...which made me subtract 4ac instead of adding the resulting positive...wowwwwwwwwwww no wonder I kept getting two positive t's thanks for your answer, anonymousthanks earth man and steve. haha I should have done the problem one more time and double checked my minus signs...that screwed me up. more

Resolved Question: Help With Precalculus Worksheet?

2. Solve the following: a) A small fast – food restaurant invest $5000 to produce a new food item that will sell for $3.49. Each iterm can be produced for $2.16. i) How many items must be sold to break even ? ii) How many items must be sold to make a profit of $8500? b) You are offered two jobs selling dental supplies. One company offers a straight commission of 6% of sales. The other company offers a salary of $350 per week plus 3% of sales. How much would you have to sell in a week in order to make the straight commission offer better? c) At a local high school city championship basketball game, 1435 tickets were sold. A student admission ticket cost $1.50 and an adult admission ticket cost $5.00. The total ticket receipts for the basketball game were $3552.50. How many of each type of ticket were sold? d) A small corporation borrowed $775,000 to expand its clothing line. Some of the money was borrowed at 8%, some at 9%, and some at 10%. How much was borrowed at each rate if the annual interest owed was $67,500 and the amount borrowed at 8% was four times the amount borrowed at 10% 6. a) A triangular brick wall is made by cutting some bricks in half to use in the first column of every row. The wall has 28 rows. The top row is one – half brick wide and the bottom row is 14 bricks wide. How many bricks are used in the finished wall? b) Determine the seating capacity of an auditorium with 36 rows of seats if there are 15 seats in the first row, 18 seats in the second row, 21 seats in the third row, and so on. c) An object with negligible air resistance is dropped from the top of the Petronas Toweers in Malaysia at a height of 1483 feet. During the first second of the fall, the object falls 4.9 feet, during the second second, it falls 14.7 feet, during the third second, it falls 34.3 feet. If this arithmetic pattern continues, how many feet will the object fall in 17 seconds? 9. a) A tool and die company buys a machine for $135,000 and it depreciates at a rate of 30% per year. (In other words, at the end of each year the depreciated value is 70% of what it was at the beginning of the year.) Find the depreciated value of the machine after 5 full years. b) A rubber ball is dropped from a height of 60 feet. If it rebounds approximately two – thirds the distance after each fall, use an infinite geometric series to approximate the total distance the ball travels. more

Voting Question: While driving on the interstate one day at 27.8 m/s (60.0 mph) I accidentally dropped the Encyclopedia of phys?

4.While driving on the interstate one day at 27.8 m/s (60.0 mph) I accidentally dropped the Encyclopedia of Physics out the window 1.15 m above the ground. Determine the following … a.the horizontal and vertical components of the book's velocity the instant I released it b.the time the book was in the air c.the horizontal distance the book traveled before hitting the ground d.the horizontal and vertical components of the book's velocity the instant it hit the ground more

Resolved Question: grade 11 geometric series question.. help?

a ball is thrown 16 m into the air. the ball falls, rebounds to half of its previous height, and falls again. if the ball continues to rebound and fall in this manner, find the total distance the ball travels until it hits the ground for the sixth time. answer: 63 m i don't know how the answer is 63.. i keep getting 31.5 m as the answer.. can someone help me please? more

Voting Question: Please i need help on this math problem?

When I ride my bike in still air, the air resistance exerts a force on me proportional to the square of my speed. The amount of energy I use to pedal to overcome this is proportional to the product of the force of the air resistance and the distance I travel. How many times more energy do I use to bike for one hour at 15 mph instead of for one hour at 5 mph? _____________________? more

Resolved Question: Physics questions please help!!?

1. The Queen Mary 2, whose maiden voyage was in January 2004, is a cruise ship that has a mass of 150,000 gross tons (which equals 1.52×108 kg, about three times that of the Titanic). Her electrically driven pod motors have a maximum power rating of 1.57×105 hp, or 117 MW. (a) What is the kinetic energy of the QM2 when she is moving at 15.0 meters/second? (b) What is the work done by the ships motors to accelerate the ship from 0-15m/s. (c) Find the absolute minimum time in which the ship's engines could accelerate her from rest up to 15.0 m/s. Ignore the drag resistance of the water, air, and so on. (d) What is the force that the ship's propellers exert on the water when the Queen Mary 2 is moving at 15.0 m/s (assume that the maximum power is used)? 2. Coasting along at 7.5m/s, a 60.0kg bicyclist on a 7.00kg bicycle encounters a small hill. If the she coasts uphill until coming to a stop, how high up the hill did she travel? (b) What height would the bike reach if she had gone to the store and had 5.50kg of groceries before coasting up the hill? 3. A goalie for the newly-created sport of "ice soccer" stops a soccer ball skidding along the ice without rolling, over a distance of 0.8 m. The ball comes to a complete stop from it’s initial speed of 5.66m/s. What force must goalie's hands made with it the 0.500 kg ball? Ignore friction. 4. When playing shuffleboard, a player exerts a constant force of 2.1 N on an initially stationary puck, at an angle 55° below the horizontal. If the player pushes the puck for 1.5 m, how fast is the puck moving when it is released? The mass of a puck is 0.49 kg. Ignore the force of friction. 5. Early one February morning you go outside to build a snow man. You make a 3.2kg snowball and lift it to a height of 1.2m, then carry it 25m on level ground with a force of 1.0N to your snowman and then lift it up the rest of the way to set as the head of a 2.3m snowman. How much work do you do on the snowball as you transport it and position it on your masterpiece? 11. Calculate the kinetic energy of a 5.2 kg object moving at 2.4 m/s. 12. Calculate the potential energy of a 5.20 kg object positioned 5.81 m above the ground. 13. Calculate the speed of a 5.2 kg object which possesses 26.1 J of kinetic energy. more

Resolved Question: I need physical science help, Can someone please help me?

1. Which type of mechanical wave needs a source of energy to produce it? (1 point) a transverse wave a longitudinal wave a surface wave all of the above 2. In an earthquake, a P wave is a longitudinal wave. It moves through soil and rock as a _____. (1 point) wavy line series of faults series of compressions and rarefactions series of crests and troughs 4. How does reflection differ from refraction and diffraction? (1 point) Reflection is the only process in which the wave does not continue moving forward. Reflection is the only process that involves a change in the wave. Reflection affects all types of mechanical waves, but refraction and diffraction do not. Reflection is the only process that changes the direction of a wave. 5. What is one property of a wave that determines how much it will diffract when it encounters an obstacle? (1 point) speed amplitude polarization wavelength 6. Which wave will probably be diffracted the most by an obstacle? (1 point) a longitudinal wave the wave with the highest amplitude the wave with the longest wavelength the wave that strikes a solid barrier with the slowest speed 7. The formation of a standing wave requires _____. (1 point) the traveling of a wave for a long distance constructive interference between two waves of slightly different frequencies that refraction and diffraction occur at the same time in a wave interference between incoming and reflected waves 8. In which medium does sound travel the fastest? (1 point) salt water fresh water air cast iron 9. Sonar equipment sends sound waves into deep water and measures _____. (1 point) refraction of the transmitted wave only the direction of the reflected wave the time delay of the returning echoes interference of the transmitted and reflected waves 10. An ambulance siren sounds different as it approaches you than when it moves away from you. What scientific term would you use to explain how this happens? (1 point) ultrasound diffraction rarefaction the Doppler effect 11. The part of the ear that sends coded nerve signals to the brain is _____. (1 point) the outer ear the inner ear the middle ear the eardrum 12. In a transverse wave, _____ is measured from crest to crest or from trough to trough. (1 point) amplitude frequency wavelength periodic motion 13. If a wave has a wavelength of 6 m and a frequency of 2 hertz, its speed is _____. (1 point) 3 m/s 0.33 m/s 1 m/s 12 m/s 15. When you shake the end of a rope to make a wave, how can you increase the amplitude of the wave? (2 points) 16. What sounds can damage hearing? (2 points) 18. In a large cave, you can hear an echo a few seconds after you speak. Explain how this happens in terms of wave properties. (3 points) more