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: 14

Answer

(a) $\omega$ is positive and $\alpha$ is positive. (b) $\omega$ is negative and $\alpha$ is positive. (c) $\omega$ is positive and $\alpha$ is negative. (d) $\omega$ is negative and $\alpha$ is negative.

Work Step by Step

$\omega$ is positive when the object is rotating counterclockwise. $\omega$ is negative when the object is rotating clockwise. $\alpha$ is positive when the angular acceleration is counterclockwise. $\alpha$ is negative when the angular acceleration is clockwise. (a) $\omega$ is positive and $\alpha$ is positive. (b) $\omega$ is negative and $\alpha$ is positive. (c) $\omega$ is positive and $\alpha$ is negative. (d) $\omega$ is negative and $\alpha$ is negative.
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