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- 1. Multiple Choice
A 15.0-kilogram mass is moving at 7.50 meters per second on a horizontal, frictionless surface. What is the total work that must be done on the mass to increase its speed to 11.5 meters per second?
120. J
422 J
570 J
992 J
- 2. Multiple Choice
A child, starting from rest at the top of a playground slide, reaches a speed of 7.0 meters per second at the bottom of the slide. What is the vertical height of the slide? [Neglect friction.]
0.71 m
2.5 m
1.4 m
3.5 m
- 3. Multiple Choice
A small electric motor is used to lift a 0.50-kilogram mass at constant speed. If the mass is lifted a vertical distance of 1.5 meters in 5.0 seconds, the average power developed by the motor is
0.15 W
1.5 W
3.8 W
7.5 W
- 4. Multiple Choice
Two construction cranes are used to lift identical 1200-kilogram loads of bricks the same vertical distance. The first crane lifts the bricks in 20. seconds and the second crane lifts them in 40. seconds. Compared to the power developed by the first crane, the power developed by the second crane is
the same
twice as great
half as great
four times as great
- 5. Multiple Choice
A 1.47-newton baseball is dropped from a height of 10.0 meters and falls through the air to the ground. The kinetic energy of the ball is 12.0 joules the instant before the ball strikes the ground. The maximum amount of mechanical energy converted to internal energy during the fall is
2.7 J
12.0 J
14.7 J
26.7 J
- 6. Multiple Choice
After a 65-newton weight has fallen freely from rest a vertical distance of 5.3 meters, the kinetic energy of the weight is
12 J
340 J
910 J
1800 J
- 7. Multiple Choice
A garden tractor drags a plow with a force of 500 Newtons a distance of 10 meters in 20 seconds. How much work is done?
25 J
250 J
1000 J
5000 J
- 8. Multiple Choice
Which pair of quantities can be expressed using the same units?
acceleration and weight
impulse and potential energy
power and momentum
work and kinetic energy
- 9. Multiple Choice
A cart weighing 10 newtons is pushed 10 m on a level road by a force of 5 newtons.
What is the increase in its potential energy?
1 Joule
50 Joules
100 Joules
0 Joules
- 10. Multiple Choice
A student throws a ball upward at an angle of 45˚.
Which statement best describes the ball at the highest point it reaches?
its acceleration is zero.
its acceleration is at a maximum
its potential energy is at a minimum
its kinetic energy is at a minimum.
- 11. Multiple Choice
An average force of 20. newtons pulls back the string of a bow 0.60 m.
As the arrow leaves the bow, its kinetic energy gain is
3.4 J
6.0 J
12 J
33 J
- 12. Multiple Choice
A 3.00 kg toy falling from a height of 10. m. gains at the ground only 270 J of kinetic energy.
How much energy was approximately dissipated (lost) due to air resistance?
318J
294 J
270 J
24 J
- 13. Multiple Choice
An object is thrown vertically upward. Which pair of graphs best represents the object’s kinetic energy and
gravitational potential energy as functions of its displacement while it rises?
- 14. Multiple Choice
A 1-kilogram rock is dropped from a cliff 90 meters high.
After falling 20 meters, the kinetic energy of the rock is approximately
20 J
200 J
700 J
900 J
- 15. Multiple Choice
A 60-kilogram runner has 1920 joules of kinetic energy.
At what speed is she running?
5.66 m/s
8.00 m/s
32.0 m/s
64.0 m/s
- 16. Multiple Choice
When a force moves an object over a rough, horizontal surface at a constant velocity, the work done against
friction produces an increase in the object’s
weight
Kinetic energy
potential energy
internal energy
- 17. Multiple Choice
A shopping cart slows as it moves along a level floor. Which statement describes the energies of the cart?
The kinetic energy increases and the gravitational potential energy remains the same.
The kinetic energy increases and the gravitational potential energy decreases.
The kinetic energy decreases and the gravitational potential energy remains the same.
The kinetic energy decreases and the gravitational potential energy increases.
- 18. Multiple Choice
The diagram shows a bicyclist at the top of a hill, with four points labeled W, X, Y, and Z.
Assume that the bicyclist does not apply the brakes as he rides down the hill.
At which point will the bicyclist’s kinetic energy be closest to zero?
point W
point X
point Y
point Z
- 19. Multiple Choice
A 0.50-kilogram ball is thrown vertically upward with an initial kinetic energy of 25 joules.
Approximately how high will the ball rise? [Neglect air resistance.]
2.6 m
5.1 m
13 m
25 m
- 20. Multiple Choice
A 5-kg cart is rolling along on the ground when an additional 5-kg mass is placed on the cart.
The KE of the cart is now:
four times as great
one fourth as great
twice as great
the same
- 21. Multiple Choice
The diagram shows a 155-newton box on a ramp. Applied force F causes the box to slide from point A to B.
What is the total amount of gravitational potential energy gained by the box?
28.4 J
279 J
868 J
2740 J
- 22. Multiple Choice
The diagram shows a pendulum consisting of a mass m,and string of length L at three positions. When released from rest at point A, the pendulum begins to swing freely between points A and B.
Which statement is true about this swinging pendulum?
The potential energy at A equals kinetic energy at point B.
The speed of the pendulum at A equals the speed of the pendulum at B.
The potential energy at the bottom of the swing equals the potential energy at B.
The potential energy at A equals the kinetic energy at the bottom of the swing.
- 23. Multiple Choice
A constant force is used to keep a block sliding at constant velocity along a rough horizontal track.
As the block slides, there could be an increase in its
gravitational potential energy, only
internal energy and kinetic energy
gravitational potential energy and kinetic energy
internal energy, only
- 24. Multiple Choice
Which graph best represents the relationship between the kinetic energy, KE, and the velocity of an object accelerating in a straight line?
(1)
(2)
(3)
(4)
- 25. Multiple Choice
A person weighing 6.0 × 102 newtons rides an elevator upward at an average speed of 3.0 meters per second for 5.0 s. How much does this person’s gravitational potential energy increase as a result of this ride?
3.6 × 102 J
1.8 × 103 J
3.0 × 103 J
9.0 × 103 J
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