Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 8 - Think and Solve: 49

Answer

3 rotations per second.

Work Step by Step

Her angular momentum is conserved (does not change) because no net external torque acts on her. Angular momentum is the product of her rotational inertia and rotational velocity, so if her rotational inertia is divided by 3, her rotational velocity (spin rate) triples to keep the product constant. This is discussed on page 152, and shown in Figure 8.53.
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