What should be the period of rotation of earth so as to make any ob...

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What should be the period of rotation of earth so as to make any object on the equator weigh half of its present value'?
\( \mathrm{P} \)
(A) 2 hrs
(B) \( 24 \mathrm{hrs} \)
W
(C) \( 8 \mathrm{hrs} \)
(D) \( 12 \mathrm{hrs} \)
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