Answer
The cap expands, but not the bottle.
Work Step by Step
The hot water heats up the bottle cap, expanding it, but not the bottle. The cap fits more loosely and may be unscrewed with less torque.
University Physics with Modern Physics (14th Edition)
by Young, Hugh D.; Freedman, Roger A.
Published by
Pearson
ISBN 10:
0321973615
ISBN 13:
978-0-32197-361-0
Chapter 17 - Temperature and Heat - Problems - Discussion Questions - Page 573: Q17.6
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