College Physics (4th Edition)

Published by McGraw-Hill Education
ISBN 10: 0073512141
ISBN 13: 978-0-07351-214-3

Chapter 2 - Multiple-Choice Questions - Page 63: 12


(b) $\mu_s \geq 0.5$

Work Step by Step

The correct answer is: (b) $\mu_s \geq 0.5$ Since the heater doesn't budge when Tim pushes with a force of 400 N, the force of static friction must be 400 N. However, a force of 400 N is not necessarily the maximum possible force of static friction. Therefore: $F_N~\mu_s \geq 400~N$ $(800~N)~\mu_s \geq 400~N$ $\mu_s \geq 0.5$
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