College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question

For the following situations, determine whether the energy of the given system is the same at the initial and final states indicated (i.e., is the energy of the system constant or not).

1. A person wearing roller skates is standing in front of a wall. Assume that the wheels on the skates are good enough that they roll ideally. The person pushes off the wall and begins traveling away from the wall. Call the initial state when the person was standing at rest in front of the wall with her hand touching the wall. The final state is when she has traveled 3 m away from the wall and is moving at a constant speed of 0.71 m/s.

      • System: wall
      • System: girl + wall
      • System: girl

2. A person is jumping on a trampoline. After coming off of the trampoline, he is in the air for 0.8 seconds. Call the initial state when the trampoline is at its lowest point with the person still on the trampoline. The final state is 0.7 seconds after the person comes off the trampoline.

      • System: girl + trampoline
      • System: girl + trampoline + Earth
      • System: trampoline
      • System: girl + Earth
      • System: girl
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