Essential University Physics: Volume 1 (4th Edition)

Published by Pearson
ISBN 10: 0-134-98855-8
ISBN 13: 978-0-13498-855-9

Chapter 10 - Section 10.3 - Rotational Inertia and the Analog of Newton’s Law - Example - Page 184: 10.8


9 seconds

Work Step by Step

First, we convert rotations per minute to radians per second. This gives that the object is rotating at $1.05 \ rads/s$. Thus, we find: $\Delta t = \frac{ \Delta \omega}{\alpha} = \frac{\Delta \omega \times MR}{4F} = \frac{ 1.05 \times .7 \times 940} {4\times 20} \approx 9 \ s$
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