Questions
A solid cylinder of mass 2 kg and radius 4 cm rotating about its axis at the rate of 3 rpm. The torque required to stop after revolutions is
detailed solution
Correct option is B
Given : Mass M=2 kg , Radius R=4 cm Initial angular speed ω0=3rpm=3×2π60rad/s=π10rad/s We know that, ω2=ω02+2αθ ⇒ 0=π102+2×α×2π×2π ⇒ α=-1800rad/s2 Moment of inertia of a solid cylinder, I=MR22=2×410022=16104 Torque τ=Iα=16104×-1800=-2×10-6NmTalk to our academic expert!
Similar Questions
A body is placed on a horizontal frictionless surface. When a horizontal force F is applied on the body, it is observed that the body makes only translational motion. The which of the following points may be the positions of its centre of mass?
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