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

Question

A ballet dancer suddenly folds her outstretched arms. Her angular velocity (A) increases (B) decreases (C) remains the same (D) may increase or decrease

Tardigrade Admin · Accepted Answer

According to law of conservation of angular momentum,

I ω =

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.

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

increases

decreases

remains the same

may increase or decrease

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.