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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 the planet and the star is proportional to R-5/2
(a) T2 is proportional to R3
(b) T2 is proportional to R7/2
(c) T2 is proportional to R3/2
(d) T2 is proportional to R3/73

Lokesh kumar , 10 Years ago
Grade 6
anser 1 Answers
Deepak Patra

Last Activity: 10 Years ago

(b) KEY CONCEPT : The centripetal force is provided by the gravitational force of attraction

mR?2 = GMmR-5/2

? mR x 4p2 / T2 = GMm /R5/2 ? T2 ? R7/2

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