# Chapter 13 - Temperature and Kinetic Theory - Questions: 13

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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