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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 planet and star is proportional  R-(5/2)to , then T2 is proportional to

(a)    R3                  (b)R7/2

(c)  R5/2                  (d) R3/2

Answer: b

 

(13)

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