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Angular momentum is conserved in a system whose moment of inertia is decreased. What happens to K.E. of rotation
(A) decreases
(B) increases
(C) remains the same
(D) cannot say
remains the same
ans is (b)because L(constant)=Iw(omega),therefore w=L/I
K.E.=(1/2)Iw2
K.E.=L/2I
therefore,K.E.is inversely proportional to I.
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