Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 9 - Work and Kinetic Energy - Conceptual Questions: 9

Answer

The work done by the tension is zero.

Work Step by Step

At every point around the circle, the angle $\theta$ between the displacement vector and the direction of the tension is $90^{\circ}$. Therefore; $W = \int ~T~ds~cos(\theta)$ $W = \int ~T~ds~cos(90^{\circ})$ $W = \int ~T~ds~(0)$ $W = 0$ The work done by the tension is zero.
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