A circular ring of mass M and radius R is rotating about its axis with constant angular velocity ω ω . Two objects each of mass m get attached to the rotating ring. The ring now rotates with an angular velocity
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
In the process of attaching the objects with the ring no external torque is applied on the system. Therefore the angular momentum of the system remains constant.
⇒ ⇒ L i = L f
⇒ ⇒ I i ω ω i = I f ω ω f
⇒ ⇒ I ring ω ω . = {(I ring ) + (I A ) + (I B )} ω ω ′ ′
Putting I ring = MR 2 , I A = I B = mR 2 we obtain
ω ω ′ ′ = 
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