As shown in the figure, a bob of mass m is tied by a massless string whose other end portion is wound on a flywheel (disc) of radius r and mass m. When released from rest the bob starts falling vertically. When it has covered a distance h, the angular speed of the wheel will be:-
Option: 1
Option: 2
Option: 3
Option: 4
Conservation Of angular momentum -
Hence option (3) is correct.
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