Answer
Please see the work below.
Work Step by Step
We know that
$F=\frac{\tau}{r}$
We plug in the known values to obtain:
$F=\frac{400}{12}$
$F=33pN$
Essential University Physics: Volume 1 (4th Edition)
by Wolfson, Richard
Published by
Pearson
ISBN 10:
0-134-98855-8
ISBN 13:
978-0-13498-855-9
Chapter 10 - Exercises and Problems - Page 193: 53
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