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A disk with moment of inertia I 1 rotates about a frictionless , vertical axle with...

A disk with moment of inertia I 1 rotates about a frictionless , vertical axle with angular speed W 1 =12 rad/s . A second disk, this one having moment of inertia l 2 =2l 1 and initially not rotating , drops onto the first disk. Because of friction between the surfaces , the two eventually reach the same angular speed w 2 . What is the final angular velocity of the combined system (in kg m/s^ 2 )

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