A ballet dancer, dancing on a smooth floor is spinning about a vertical axis with her arms folded with angular velocity of $$20$$ $$rad/s$$. When she stretches her arms fully, the spinning speed decreases to $$l0$$ $$rad/s$$. If I is the initial moment of inertia of the dancer, the new moment of inertia is

Question

Infinity Learn · Accepted Answer

Here, angular momentum is conserved.Initial angular momentum: Final angular momentum    I × $$20$$ $$=$$ I'×$$10Where$$ $$1$$ is new moment of inertia   I' $$=$$ $$2I$$

A ballet dancer, dancing on a smooth floor is spinning about a vertical axis with her arms folded with angular velocity of 20 rad/s. When she stretches her arms fully, the spinning speed decreases to l0 rad/s. If I is the initial moment of inertia of the dancer, the new moment of inertia is

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