University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 10 - Dynamics of Rotational Motion - Problems - Discussion Questions - Page 328: Q10.22


See explanation.

Work Step by Step

There is no contradiction, because work is done. As explained on page 321, the increase in kinetic energy comes from the positive work that the professor performs in pulling his arms and the weights toward the center. The force and displacement are in the same direction, so the system’s kinetic energy increases.
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