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


B. T

Physics & Space Science

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A) They orbit a common center of mass. B) They were not formed together. C) They are gravitationally bound to one another. D) They drift away from each other in a few million years.

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Two conductors made of the same material are connected across the same potential difference. Conductor A has twice the diameter and twice the length of conductor B. What is the ratio of the power delivered to A to the power delivered to B?

1.8 2.4 3.2 4.1 5.12

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