Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 4 - Kinematics in Two Dimensions - Conceptual Questions - Page 110: 15


(a) $\omega = 0$ (b) $\alpha$ is negative

Work Step by Step

(a) Since the pendulum is at one end of its arc, the pendulum is momentarily at rest. Therefore $\omega = 0$ (b) Although the pendulum is momentarily at rest, the angular acceleration $\alpha$ is non-zero and it is directed in the clockwise direction. Since the clockwise direction is considered the negative direction, $\alpha$ is negative.
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