Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that theycouple and rotate as one unit. The first disk, with rotational inertia 1.99 kg-m² about its central axis, is set spinning counterclockwise(which may be taken as the positive direction) at 422 rev/min. The second disk, with rotational inertia 7.97 kg-m² about its central axis,is set spinning counterclockwise at 679 rev/min. They then couple together. (a) What is their angular speed after coupling? If insteadthe second disk is set spinning clockwise at 679 rev/min, what are their (b) angular velocity (using the correct sign for direction) and (c)direction of rotation after they couple together?(a) NumberiUnits(b) NumberiUnits(c)

Solution: (a). In this problem, there is no external torque is acting. The angular momentum would be…

Answered: Two disks are mounted (like a…

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