JEE Advanced 2020 Full Test 4 Paper 2

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Question : 4 of 54

Marks: +1, -0

A horizontal disc rotates freely about a vertical axis through its centre. A ring, having the same mass and radius as the disc, is now gently placed on the disc. After some time, they rotate with a common angular speed.

some friction exists between the disc and the ring.
the angular momentum of the disc plus ring is conserved.
the final common angular speed is ‌
2
3
rd of the initial angular velocity of the disc.
‌
2
3
rd of the initial kinetic energy changes to heat.

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