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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A circular disc of moment of inertia is rotating in a horizontal plane about its symmetry axis with a constant angular speed . Another disk of moment of inertia is dropped coaxially onto the rotating disk. Initially, the second disk has zero angular speed. Eventually, both the disks rotate with a constant angular speed . The energy lost by the initially rotating disc to friction is [CBSE PMT 2010]

Answer: (A)

Solution

Angular momentum conservation gives , so the energy lost is $ω_ -

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Question ID VK-040613