Conceptual Physics (12th Edition)

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

Chapter 15 - Think and Discuss: 99

Answer

The ball would pass through more easily.

Work Step by Step

When the metal ring is heated, it expands uniformly, as though a 3D picture of it were enlarged on a magical photocopier. The thickness, outer and inner circumference all expand. So the ball that could pass through a cool ring will easily pass through the expanded hole in the hot ring. Another way to think about this is that the hole will expand precisely as much as a pancake-shaped plug of the same metal that filled the hole.
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