1.

If the earth shrinks such that its mass does not change but radius decreases to one quarter of its original value then one complete day will take.

Answer»

96 h
48 h
6 h
`1.5` h

Solution :Angular momentum of SPIN `=I omega`
By the CONSERVATION of angular momentum
`(2)/(3)" MR"^(2)(2pi)/(T)=(2)/(5)M((R )/(4))^(2)(2pi)/(T.)`
`rArr T.=(T)/(16)=(24)/(16)=1.5`h


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