Essential University Physics: Volume 1 (3rd Edition)

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

Chapter 10 - Section 10.4 - Rotational Energy - Got It?: 10.6

Answer

b) more

Work Step by Step

Recall that work done is equal to the change in kinetic energy. In both cases, the moment of inertia is the same, so we compare the differences in angular velocities squared. Because $200^2$ minus $100^2$ is greater than $100^2$ minus $0^2$, it will take more work to get the wheel to 200 rpm.
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