First slide

Law of conservation of angular momentum

Question

If a person standing on a rotating disc stretches out his hands, the angular speed will

Easy

A

increase
B

decrease
C

remain same
D

None of these

Solution

We have, $I ω = L = constant \Rightarrow ω \propto 1 / I$
On stretching hands, I will increase, therefore $ω$ will decrease.

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