Medium
$A$ small planet is revolving around a very massive star in a circular orbit of radius $R$ with a period of revolution $T$. If the gravitational force between the planet and the star were proportional to $R^{-5/2}$,then $T$ would be proportional to:
- A$R^{3/2}$
- B$R^{3/5}$
- C$R^{7/2}$
- D$R^{7/4}$
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