A disc of mass 2 kg and radius 0.2 m is rotating with an angular velocity of 30 rad s -1 . The angular velocity of the disc, if a mass of 0.25 kg is put on the periphery is
Text Solution
Verified by ExpertsThe correct answer is:
A
24 rad s -1
If no external torque acts on a system of particle then angular momentum of the system remains constant, that is,
constant
...(i)
Here, M = 2 kg, m = 0.25 kg and r = 0.2 m
= 30 rad s -1
Hence, we get after putting the given values in Eq. (i)
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