College Physics (4th Edition)

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

Review & Synthesis: Chapters 6-8 - MCAT Review - Page 327: 8


The correct answer is: B. $25~N$

Work Step by Step

The two pads provide a total retarding force of 20 N. Since there are two pads, each pad provides a retarding force of 10 N. We can find the normal force $F_N$ of each pad on the wheel: $F_N~\mu_k = 10~N$ $F_N = \frac{10~N}{\mu_k}$ $F_N = \frac{10~N}{0.4}$ $F_N = 25~N$ The correct answer is: B. $25~N$
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