## Conceptual Physics (12th Edition)

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.