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Physics Test Review Worksheet - Work, Power, Energy and Machines - Answers

This worksheet is designed to help you review for your test on work, power, energy and machines.

After scoring a touchdown, an 84-kg wide receiver celebrates by leaping 120 cm off the ground. How much work is done in the celebration?987.84 J
During a tug-of-war, Team A does 2.2 x 10^5 J of work by pulling Team b 8 m. What force is Team A exerting?27,500 N
A weightlifter raises a 150-kg barbell to a height of 1.45 m. How much work is done by the weightlifter in lifting the barbells?2131.5 J
A wagon is pulled by a force of 38 N on the handle at an angle of 42˚ with the horizontal. If the wagon is pulled in a circle of radius 25 m, how much work is done?4435.85 J
A lawn mower is pushed with a force of 88 N along a handle that makes an angle of 41˚ with the horizontal. How much work is done in pushing the mower 1.5 km in mowing the yard?99,621.66 J
A 15-kg crate is to be pulled a distance of 30 m, requiring 1280 J of work being done. If the job is done by attaching a rope and pulling with a force of 85 N, at what angle is the rope held?59.9˚
An elevator lifts a total mass of 1100 kg a distance of 40 m in 12.5 s. How much power does the elevator demonstrate?34,496 W
A cyclist exerts a force of 15 N in riding a bike 251 m in 30 s. What is the cyclist's power?125.5 W
Calculate the kinetic energy of a proton, mass 1.67 x 10^-27 kg, traveling at 5.20 x 10^7 m/s.2.26 x 10^-12 J
What is the kinetic energy of a 3.2-kg pike swimming at 2.7 km/h?0.90 J
A force of 30 N pushes a 1.5-kg cart, initially at rest, a distance of 2.8 m along a frictionless surface. Find the work done on the cart. What is the change in kinetic energy? What is the cart's final velocity?84 J; 84 J; 10.58 m/s
A 712-kg car is traveling at 5.6 m/s when a force acts on it for 8.4 s, changing its velocity to 10.2 m/s. What is the change in kinetic energy of the car?25,874.08 J
Five identical 0.85-kg books of 2.5-cm-thickness are each lying flat on a table. Calculate the gain in potential energy of the system if they are stacked one on top of the other.2.08 J
A motorist whose car is out of gas pushes it at a steady speed of 0.75 m/s with a force of 200 N. What power does he deliver to the car?150 W
What is the change in gravitational potential energy of a 1-kg mass that is carried from the surface of the Earth to a distance of one Earth radius above the surface?62,524,000 J
A car engine develops 30 hp in moving the car at a constant speed of 50 mi/h. What is the average retarding force acting on the car?1001.5 N
In a wild shot, Bo flings a pool ball of mass m off a 0.68-m-high pool table, and the ball hits the floor with a speed of 6.0 m/s. How fast was the ball moving when it left the pool table?4.76 m/s
Kathy is changing the tire of her car on a steep hill 20.0 m high. She trips and drops the 10.0-kg spare tire, which rolls down the hill with an initial speed of 2.00 m/s. What is the speed of the tire at the top of the next hill, which is 5.00 m high?17.26 m/s
A horizontal force of 50 N pushes a block along a level table at a constant speed of 4 m/s. How much work is done on the block in 8 s?1600 J

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