## Essential University Physics: Volume 1 (4th Edition)

Published by Pearson

# Chapter 1 - For Thought and Discussion - Page 12: 3

#### Answer

Please see the work below.

#### Work Step by Step

We know that the earth's rotation on its axis is not a uniform motion. It is sometimes an accelerated motion and sometimes decelerated motion. Hence, the interval to cover a specific distance changes. Let's say that we measure a particular distance and fix the interval for it as second, but when we repeat the experiments, we will have a different distance traveled. Thus, the definition of second cannot be fixed if using the earth's rotation to define it.

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.