If radius of the earth contracts to half of its present value without change in its mass, what will be the new duration of the day?

If radius of the earth contracts to half of its present value without

1.	If radius of the earth contracts to half of its present value without change in its mass, what will be the new duration of the day?
Answer» Solution :`W=(1//2) I(omega_(1)^(2)-omega_(2)^(2)) =(1//2)(2//5) mR^(2)[(2pi//T_(1))^(2) -(2pi//T_(2))^(2)]=9.36 xx 10^(28) J`