physics

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A turntable with a moment of inertia of 0.014 kg*m2 rotates feely at 2.7 rad/s. A circular disk of mass 500 g and diameter 22 cm, and initially not rotating, slips down a spindle and lands on the turntable.

a) Find the new angular speed.
rad/s

b) what is the change in kinetic energy?
J

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