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18. Alternative sources of energy include 28. An iron cannonball and a bowling ball are dropped at the same
a. solar cells. time from the top of a building. At the instant before the balls hit
b. wind. the sidewalk, the heavier cannonball has a greater
c. hydrogen. a. velocity.
d. all of the above. b. acceleration.
19. A renewable energy source is c. kinetic energy.
a. coal. d. All of these are the same for the two balls.
b. biomass. 29. Two students are poised to dive off equal-height diving towers

c. natural gas. into a swimming pool below. Student B is twice as massive as
d. petroleum. student A. Which of the following is true?

20. The potential energy of a box on a shelf, relative to the floor, is a a. Student B will reach the water sooner than student A.
measure of b. Both students have the same gravitational PE.
a. the work that was required to put the box on the shelf from c. Both students will have the same KE just before hitting the water.
the fl oor. d. Student B did twice as much work climbing the tower.
b. the weight of the box times the distance above the fl oor. 30. A car is moving straight down a highway. What factor has the
c. the energy the box has because of its position above the greatest influence on how much work must be done on the car to

fl oor. bring it to a complete stop?
d. all of the above. a. How fast it is moving

21. A rock on the ground is considered to have zero potential b. The weight of the car

energy. In the bottom of a well, the rock would be considered c. The mass of the car

to have d. The latitude of the location
a. zero potential energy, as before. 31. Two identical cars are moving straight down a highway under
b. negative potential energy. identical conditions, except car B is moving three times as fast as
c. positive potential energy. car A. How much more work is needed to stop car B?
d. zero potential energy but would require work to bring it back a. Twice as much
to ground level. b. Three times as much

22. Which quantity has the greatest influence on the amount of c. Six times as much
kinetic energy that a large truck has while moving down the d. Nine times as much
highway? 32. When you do work on something, you give it energy
a. Mass a. oft en.
b. Weight b. sometimes.
c. Velocity c. every time.
d. Size d. never.
23. Electrical energy can be converted to 33. Which of the following is not the use of a solar energy
a. chemical energy. technology?
b. mechanical energy. a. Wind
c. radiant energy. b. Burning of wood
d. any of the above. c. Photovoltaics
24. Most all energy comes to and leaves Earth in the form of d. Water from a geothermal spring
a. nuclear energy. 34. Today, the basic problem with using solar cells as a major source
b. chemical energy. of electricity is
c. radiant energy. a. effi ciency.
d. kinetic energy. b. manufacturing cost.
25. A spring-loaded paper clamp exerts a force of 2 N on 10 sheets of c. reliability.
paper it is holding tightly together. Is the clamp doing work as it d. that the Sun does not shine at night.

holds the papers together? 35. The solar technology that makes more economic sense today
a. Yes. than the other applications is
b. No. a. solar cells.
26. The force exerted when doing work by lifting a book bag against b. power tower.

gravity is measured in units of c. water heating.
a. kg. d. ocean thermal energy conversion.
b. N. 36. Petroleum is believed to have formed over time from buried
c. W. a. pine trees.
d. J. b. plants in a swamp.

27. The work accomplished by lifting an object against gravity is c. organic sediments.

measured in units of d. dinosaurs.
a. kg. Answers
b. N.
1. d 2. d 3. b 4. b 5. d 6. a 7. c 8. d 9. c 10. b 11. a 12. d 13. d 14. c
c. W.
15. b 16. b 17. c 18. d 19. b 20. d 21. d 22. c 23. d 24. c 25. b 26. b
d. J.
27. d 28. c 29. d 30. a 31. d 32. c 33. d 34. b 35. c 36. c
82 CHAPTER 3 Energy 3-22