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(1 point) A circular disk of mass 0.2 kg and radius 27 cm, initially not rotating,...

(1 point) A circular disk of mass 0.2 kg and radius 27 cm, initially not rotating, slips down a thin spindle onto a turntable (disk) of mass 1.9 kg and the same radius, rotating freely at 3.1 rad/s.

a) Find the new angular velocity of the combination; rad/s

b) The change in the kinetic energy? J

c) If the motor is switched on after the disk has landed, what is the constant torque needed to regain the original speed in 3.2 s? ?∗?

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