| A | B |
|---|
| After scoring a touchdown, an 95-kg wide receiver celebrates by leaping 80 cm off the ground. How much work is done in the celebration? | 745.56 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 140-kg barbell to a height of 1.65 m. How much work is done by the weightlifter in lifting the barbells? | 2266.11 J |
| A wagon is pulled by a force of 42 N on the handle at an angle of 34˚ with the horizontal. If the wagon is pulled in a circle of radius 15 m, how much work is done? | 3281.67 J |
| A lawn mower is pushed with a force of 92 N along a handle that makes an angle of 44˚ with the horizontal. How much work is done in pushing the mower 1.8 km in mowing the yard? | 119,122.67 J |
| A 15-kg 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? | 59.87˚ |
| 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? | 34,531.2 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 |
| 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 (6.38 x 10^6 m) above the surface? | 62,587,800 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? | 1001.47 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? | 17.27 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 |
| 2.6 J of energy are used to compress a spring 10 cm. What is the spring constant of the spring? | 520 N/m |
| How much energy is required to stretch a spring with a spring constant of 150 N/m 15 cm? | 1.69 J |
| If the mass of an object is doubled and the speed of the object is cut in half, what would happen to the kinetic energy of the object? | It would be cut in half. |
| Two objects are dropped from the same height. How do the potential energies of the objects compare if the mass of the second object is 3 times the mass of the first object? | The potential energy of the second object is three times greater than the potential energy of the first. |
| What is the potential energy of a 4-kg box being pushed 10 m horizontally? | 0 J |
The graph below represents the relationship between the force exerted on an elevator and the distance the elevator is lifted. How much total work is done by the force in lifting the elevator from 0.0 m to 9.0 m?,  | 150,000 J |
The graph below represents the work done against gravity by a student as she walks up a flight of stairs at constant speed. How much power is generated by the student?,  | 266.67 W |
