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The mass of a planet that has a moon whose time period and orbital radius are T and R respectively can be written as

(a)   4π2 R3 G-1T-2             (b) 8π2 R3 G-1T-2

(c)  12π2 R3 G-1T-2                   (d) 16π2 R3 G-1T-2

Answer: a

(10)

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