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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
A 25 kg child sits in a swing that is attached to ropes 1.6 m long. Find the potential energy of the child relative to his lowest position when the ropes (a) are horizontal, (b) are vertical, and (c) make 30-degrees with the horizontal.
How did it arrive with the answers:
a) Ugravitational = 390 J
b) UGvertical = 0
c) U = 200 J
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