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Q.

A ballet dancer folds his hand, in a such a way that its rotational kinetic energy increases by 25%. If original moment of inertia is I, final moment of inertia will be

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An Intiative by Sri Chaitanya

a

0.5 I 

b

0.75 I 

c

1.2 I  

d

0.8I

answer is D.

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Detailed Solution

KE=L22IKE×I= constant

So the new Kinetic energy is 1.25 KE.

hence the final moment of interia is 0.8I.

It is decreased by 20%.

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