The rotation of the earth having $R$ radius about its axis speeds up to a value such that a man at latitude angle $60^o$ feels weightlessness. The duration of the day in such a case is.
The rotation of the earth having $R$ radius about its axis speeds up to a value such that a man at latitude angle $60^o$ feels weightlessness. The duration of the day in such a case is.
- A
$2 \pi \sqrt{\frac{R}{g}}$
- B
$ \pi \sqrt{\frac{R}{g}}$
- C
$2 \pi \sqrt{\frac{g}{R}}$
- D
$4 \pi \sqrt{\frac{R}{g}}$
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