Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 1 - Think and Explain: 29

Answer

Because a scientific theory is based on a lot of physical evidence gathered from experiments.

Work Step by Step

To take an extreme example, suppose the planet were so small that the two cities were 1/4 of the way around the world from one another. When the sun is overhead at Syene, it is at the horizon in Alexandria, and the pillar casts a very long shadow. In other words, on a smaller planet the angle between the sun's rays and the pillar would be larger in Alexandria.
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