A planet of mass M orbits a star in a circular orbit of radius R,in orbital period T.What would be the orbital period of another planet,orbiting at radius R,but having mass 2M?
A) 0.71T
B) T
C) 1.4T
D) 2T
E) 0.50T

Question

Quizplus · Accepted Answer

The orbital period of a planet in a circular orbit depends only on the radius of the orbit and the mass of the star, not on the mass of the planet. Therefore, the orbital period remains T.

A Planet of Mass M Orbits a Star in a Circular