12 Questions
| Attempts: 512

Questions and Answers

- 1.Using ground level as the reference height with zero potential energy, which object has the
*greatest*gravitational potential energy?- A.
2-kg mass at 60-m height

- B.
5-kg mass at 5-m height

- C.
20-kg mass at 50-m height

- D.
40-kg mass at 2-m height

- 2.A 12.5-kg glider is observed flying at an altitude of 1,510 m at a constant velocity of 18.0 m/s. The glider dives to a new altitude of 1,250 m Neglecting the effects of air resistance, what is its change in potential energy?
- A.
31,900 J

- B.
153,000 J

- C.
85,000 J

- D.
338,000 J

- 3.A father (100 kg) and his son (50 kg) are jogging at the same speed. Which statement is true about the kinetic energies (KE) of the father and the son?
- A.
KE of father = 2KE of son

- B.
KE of father = 1/2KE of son

- C.
KEof father = 4KE of son

- D.
KE of father = 1/4KE of son

- 4.A city’s water tower has a capacity of 1000
^{ }kg of water. A pump is filling the water tower to an average height of 50.0 m. What is the potential energy of the water in the tower?- A.
2.5 E 4 J

- B.
5.0 E 4 J

- C.
4.9 E 5 J

- D.
2.5 E 6 J

- 5.How high can a worker lift a 40.0-kg bag of sand if he produces 4,000.0 J of energy? Assume no energy is used to overcome friction.
- A.
1.020 m

- B.
10.20 m

- C.
102.0 m

- D.
1,020 m

- 6.In the diagram below, a wooden block slides from rest down a frictionless incline. The block attains a speed of 3 m/s at the bottom of the incline. How high is the incline?
- A.
0.21 m

- B.
0.31 m

- C.
0.46 m

- D.
0.59 m

- 7.A skateboarder with a mass of 50 kg is riding on a half-pipe as shown in the diagram below. He has a KE of 625 J at the bottom. What distance will the skateboarder climb?
- A.
0.25 m

- B.
0.50 m

- C.
1.3 m

- D.
2.5 m

- 8.A 1.0-kilogram rubber ball traveling east at 4.0 meters per second hits a wall and bounces back toward the west at 2.0 meters per second. Compared to the kinetic energy of the ball before it hits the wall, the kinetic energy of the ball after it bounces off the wall is
- A.
One-fourth as great

- B.
The same

- C.
One-half as great

- D.
Four times as great

- 9.As a spring is stretched, its elastic potential energy
- A.
Decreases

- B.
Increases

- C.
Remains the same

- 10.Which graph best represents the relationship between the kinetic energy of a moving object and its velocity?
- A.
1

- B.
2

- C.
3

- D.
4

- 11.14. Which graph best represents the relationship between the gravitational potential energy of an object near the surface of Earth and its height above Earth’s surface?
- A.
1

- B.
2

- C.
3

- D.
4

- 12.A 1.00-kilogram ball is dropped from the top of a building. Just before striking the ground, the ball’s speed is 12.0 meters per second. What was the ball’s gravitational potential energy, relative to the ground, at the instant it was dropped? [Neglect friction.]
- A.
6.00 J

- B.
72.0 J

- C.
24.0 J

- D.
144 J

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