Question

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

• A. $ 29\sqrt{2}\,days $
• B. $ \frac{29}{\sqrt{2}}\,days $
• C. $ 29\times 2\,\,days $
• D. $ 29\,\,days $
• E. $ \frac{29}{2}\,\,days $

Answer 1

Answer: (D)

Time period, $ T=2\pi \sqrt{\left( \frac{l}{g} \right)} $ is independent of mass of revolving body.