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  4. A ballet dancer suddenly folds her outstretched arms. Her angular velocity

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Q. A ballet dancer suddenly folds her outstretched arms. Her angular velocity

AP EAMCETAP EAMCET 2020

Solution:

According to law of conservation of angular momentum,
$I \omega=$ constant.....(i)
where, $I=$ moment of inertia and
$\omega=$ angular velocity.
When a ballet dancer suddenly folds her outstretched arms, then her
moment of inertia decreases, hence from Eq. (i), we observe that her
angular velocity will increases.