Question

A disc of mass 1 kg and radius 0.1m is rotating with angular velocity 20 rad/s. What is angular velocity (in rad/s) if a mass of 0.5 kg is put on the circumference of the disc?

Joshi sir comment

by angular momentum conservation 

I1ω1 = I2ω2

so [1(0.1)2/2]20 = [1(0.1)2/2+0.5(0.1)2]ω2

solve and get ω2

Read 1 Solution.

use conservatn of L  Ie

mR2ω1= ( M+m)R^2 w2    find w new

SARIKA SHARMA 10 year ago is this solution helpfull: 29 35

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