A thin uniform circular disc of mass M and radius R is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with an angular velocity 
. Another disc of same dimension but of mass M /4 is placed gently on the first disc coaxially. The angular velocity of the system now is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
moment of inertia (I) of disc rotating initially with 'w' :-
when another disc of mass=M/4 placed coaxially new moment of inertia ( 
) about same axis.
Applying law of conservation of Angular Momentum:
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