Essential University Physics: Volume 1 (4th Edition)

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

Chapter 13 - Exercises and Problems - Page 249: 86



Work Step by Step

We first must find the time of the new period: $T = 6 \times \sqrt{\frac{90+20}{60+20}}=6 \times \sqrt{\frac{110}{80}}=7.04 \ s$ Thus, we use the equation for percent increase to obtain: $=\frac{7.04-6}{6}=.1726 = \fbox{17.26 percent}$ Thus, c is the correct answer.
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