Conceptual Physics (12th Edition)

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

Chapter 9 - Reading Check Questions (Comprehension): 7

Answer

As discussed on page 163, after G was measured, the mass of the Earth could be calculated. One compares the weight of a given mass m to the gravitational force of attraction as calculated by Newton's universal law of gravitation. The two are equal, and then one may solve for the unknown mass of the Earth.
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