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The period of moon’s rotation around the earth is nearly 29 days. If moon’s mass were 2 fold, its present value and all other things remained unchanged, the period of moon’s rotation would be nearly

(a) 29√2  days                        (b)  29 /√2  days

(c)   29 × 2 days                        (d)  29 days

Answer: d

(4)

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