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1. A disk whose moment of inertia is 2 kgm2 is rotating at 120 rad/s. This disk is pressed against a similar disk (with the same inertia) that is able to rotate freely, but initially at rest. The two disks stick together and rotate as a unit. (a) Find the final angular velocity of the combination. (b) How much energy was lost to friction when the disks were brought together?

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