A disc of mass 2 kg and radius 
is rotating with angular velocity 
. What is angular velocity, if a mass of 0.25 kg is put on periphery of the disc?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
If no external torque acts on a system of particles, then angular momentum of the system
remains constant, i.e. 
.
constant
… (i)
Here, 
Substituting the given values in Eq. (i), we get
or 
or 
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