Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 10 - Exercises and Problems: 63

Answer

17 percent

Work Step by Step

We first find the total energy: $E_t=\frac{1}{2}mv^2 + (\frac{1}{2}mv^2 )(.4) \\ E_t=.7MR^2$ We know that the mass declined by 10 percent, so we obtain: $\Delta E_t=.7\times.1=.07$ Adding the 10 percent change in inertia, it follows: $=7+10=\fbox {17 percent}$
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