Consider the Moon orbiting the Earth. _______ is the centripetal force for the orbit, and one could therefore measure the mass of the ________ by studying the Moon's orbit.
A) Drag; Earth
B) Tension; Moon
C) Gravity; Moon
D) Gravity; Earth

Question

Quizplus · Accepted Answer

Gravity acts as the centripetal force that keeps the Moon in orbit around the Earth, and by analyzing the Moon's orbit, one can determine the mass of the Earth.

Consider the Moon Orbiting the Earth