AP EAMCET Engineering 18 Sep 2020 Shift 1 Paper

( a) According to law of conservation of angular momentum,
Iω= constant......(i)
where,
I= moment of inertia and
ω= 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.