Essential University Physics: Volume 1 (4th Edition) Clone

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 7 - Section 7.2 - Potential Energy - Example - Page 117: 7.1

Answer

a) 0 J b) $49,000J$ c) $-60,000 J$

Work Step by Step

We know the following equation: $U = mgh$ Knowing that each floor is 3.5 meters tall, we find: a) 0 J; Since she defines her office as ground level, potential energy here is 0 Joules. b) She is 26 floors above her office, so she is $ 26 \times 3.5 = 91 m$ above her office. Thus: $U= 55 \times 9.81 \times 91 = 49,000J$ c) She is 32 floors below her office, so she is $ 32 \times 3.5 = 112 m$ below her office. Thus: $U= 55 \times 9.81 \times --12 = -60,000 J$
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