Essential University Physics: Volume 1 (3rd Edition)

Published by Pearson
ISBN 10: 0321993721
ISBN 13: 978-0-32199-372-4

Chapter 1 - For Thought and Discussion: 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.
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