Conceptual Physics (12th Edition)

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

Chapter 9 - Think and Rank: 48

Answer

Average gravitational force, greatest to least: C, A, B.

Work Step by Step

Use the gravity equation, putting in the 2 masses, and the distance between the 2 masses. $$F_{A}= G \frac{M m}{d^{2}}$$ Note that the sun-moon distance is about the same as the sun-Earth distance, but the moon's mass is only about 1.2% the mass of the Earth. So C $\gt$ B. The sun-Mars distance is about 1.5 times the sun-earth distance, and Mar's mass is about 11% the mass of the Earth. So C $\gt$ A $\gt$ B.
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