07_InstSolManual_PDF_Part1

07_InstSolManual_PDF_Part1 - WORK AND ENERGY 7 6 C 7 A D 8...

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7-1 W ORK AND E NERGY 7 Answers to Multiple Choice Problems 1. B 2. D 3. A 4. C 5. C 6. C 7. A, D 8. B, C, E 9. A, D, E 10. B, D 11. B, D 12. B, D 13. B, D 14. A 15. C Solutions to Problems 7.1. Set Up: Assume the fisherman is holding the pole straight out in front of him so that the pole and fishing line are roughly parallel to the water. Thus may be used in the relation Solve: Reflect: Because all of the force that the fisherman applies through the line is used to perform work on the fish. 7.2. Set Up: Use On the way up, the displacement is upward and the gravity force is downward, so On the way down, both the displacement and force are downward, so Solve: On the way up: On the way down: Reflect: When the force and displacement are in opposite directions, the work done is negative. 7.3. Set Up: Use with Solve: Reflect: Since the relatively small angle of allows the boat to apply approximately 97% of the 180 N force to pulling the skier. 7.4 Set Up: Use In part (a), In part (b), solve for Solve: (a) (b) and Reflect: More work is done in part (a) where
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