Question

A solid 2.25 kg disk is initially spinning with an angular
velocity of ω_{i} = <0, 0, 3.0> s ^{−1} . A
constant torque is applied for 3.0 s, increasing its angular
velocity to ω_{f} = <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?

Answer #1

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