Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 13 - Temperature and Kinetic Theory - Questions: 13

Answer

The clock will run slow.

Work Step by Step

The pendulum will be slightly longer on a hot day because the brass rod expands. The period of a pendulum is proportional to the square root of its length, $T = 2 \pi \sqrt{\frac{L}{g}}$, so the period will be longer. The pendulum takes more time for one cycle, so the clock runs slow.
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