Physics

Problem

Imagine a light planet revolving around a very massive star in a circular orbit of radius

R

with a period of revolution

T

. If the gravitational force of attraction between the planet and the star is proportional to

R^{-5/2}

. a.

T^2

is proportional to

R^3

T^2

is proportional to

R^{7/2}

T^2

is proportional to

R^{3/2}

T^2

is proportional to

R^{3/73}