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A solid 2.25 kg disk is initially spinning with an angular velocity of ωi = <0,...

A solid 2.25 kg disk is initially spinning with an angular velocity of ωi = <0, 0, 3.0> s −1 . A constant torque is applied for 3.0 s, increasing its angular velocity to ωf = <0, 0, 6.0> s −1 .

(a) What is the change in the rotational kinetic energy of the disk?

(b) What torque was applied in order to accelerate the disk?

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