A thin uniform circular disc of mass 
and radius 
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 thickness and radius but of mass 
is placed gently on the first disc coaxially. The angular velocity of the system is now
Text Solution
Verified by ExpertsA
Given, mass of first circular disc 
Radius of first circular disc 
Mass of second circular disc 
Moment of inertia of circular disc,
Moment of inertia of combination of disc,
According to law of conservation of angular momentum, 
constant.
Given, 
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