Determine the change in rotational kinetic energy when the rotational velocity of the turntable of a stereo system increases from 0 to 33 rpm. Its rotational inertia is 6.2×10−3kg⋅

Answer 1

Rotational Kinetic Energy = Work done by torque = (1/2)*(Moment of inertia)*(Final angular Velocity)^2

Convert rotations per minute to radians per second, plug in that value along with the value of the Moment of inertia (rotational inertia) and solve for kinetic energy.