A child stands at the center of a turnable, with his arm outstretched.Angular speed of the turnable is 40rpm. If the child holds back his arms, moment of inertia reduces to 2/5 the initial value. What is the angular speed of the child.

Asked by  | 22nd Dec, 2012, 05:34: PM

Expert Answer:

As no external torque is applied, here the net angular momentum will be conserved.
so,

Answered by  | 24th Dec, 2012, 04:40: PM

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