Difficult
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 $R^{-5/2}$,then ${T^2}$ is proportional to:
- A$R^3$
- B$R^{7/2}$
- C$R^{5/2}$
- D$R^{3/2}$
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