What should be the period of rotation of earth so as to make any object on the equator weig half of its present value?
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The required rate be `omega`. `F_(cp)=F_(gr)` `mr omega^(2)=mg implies omega=sqrt((g)/(r ))` Put `g=9.8m//sec^(2)` and `r=R=6.4xx10^(6)m` (radius of earth) `impliesT=2pisqrt((R )/(g))=84` min (approx).
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