The two disks are mounted on low-friction bearings on the similar axle and can be brought altogether so that they couple and rotate as one unit. The primary disk, with a rotational inertia of 2.508 kg-m^2 regarding its central axis, is initially spinning at a rate of 621 rpm. The second disk, with a rotational inertia of 4.092 kg-m^2 regarding its central axis, is at first spinning at a rate of 684 rpm in the similar direction as the first one. They then couple altogether
i) Determine their angular speed after coupling?
ii) If the second disk is at first spinning opposite to the first one, the find out the angular speed after coupling?