CHAPTER 7 Physics homework solutions

# CHAPTER 7 Physics homework solutions - CHAPTER 7 Solutions...

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CHAPTER 7 Solutions to Multiple Choice Problems 5. C 12. B, D Solutions to Problems 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. 7.5. Set Up: For parts (a) through (d), identify the appropriate value of and use the relation In part (e), apply the relation Solve: (a) Since you are applying a horizontal force, Thus, (b) The friction force acts in the horizontal direction, opposite to the motion, so

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(c) Since the normal force acts upward and perpendicular to the tabletop, (d) Since gravity acts downward and perpendicular to the tabletop, (e) Reflect: Whenever a force acts perpendicular to the direction of motion, its contribution to the net work is zero. 7.19. Set Up: Use the work-kinetic energy theorem: Since the net force is due to friction, Also, since the car stops, Solve: (a) gives
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