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A circular disk of moment of inertia I, is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed a. Another disk of moment of inertia I, 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 a, initially rotating disc to friction is . The energy lost by the CBSE PMT 20101 2 1 I2
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