A ballet dancer, dancing on a smooth floor is spinning about a vertical axis with her arms folded with an angular velocity of 20 rad/s. When she stretches her arms fully, the spinning speed decrease in 10 rad/s. If I is the initial moment of inertia of the dancer, the new moment of inertia is
Text Solution
Verified by ExpertsThe correct answer is:
A
Here, angular momentum is conserved.
Initial angular momentum = final angular
Momentum
]
Where I’ is new moment of inertia, 
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