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AP Physics 1
2.9 Circular Motion
2.6 Gravitational Force
IntermediateMCQProportional Analysis25.2k
A central planet is shown with two concentric circular paths around it. The inner path is labeled Moon A with a dashed line indicating a radius r_A. The outer path is labeled Moon B with a dashed line indicating a radius r_B. Moon B's orbit is shown significantly further from the planet than Moon A's orbit.
Diagram showing the circular orbital paths of Moon A and Moon B around a central planet.
A planet has two moons, Moon A and Moon B, which both travel in circular orbits. The orbital radius of Moon B is nine times the orbital radius of Moon A (\(r_B = 9r_A\)). Both moons are held in their orbits solely by the gravitational pull of the planet. What is the ratio of the orbital period of Moon B to the orbital period of Moon A, \(T_B / T_A\)?

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