A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 
revolutions is [NEET 2019]
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Given, mass of cylinder, 
Radius of cylinder, 
Rotational velocity, 
and 
revolution
The work done, 
As the cylinder is brought to rest, so the work done will be negative.
According to work-energy theorem,
Work done 
Change in rotational kinetic energy
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