In Fig. 11.15, the lower disk, of mass 440 g and radius 3.5 cm, is rotating at 180 rpm
Chapter 11, Problem 49(choose chapter or problem)
In Fig. 11.15, the lower disk, of mass 440 g and radius 3.5 cm, is rotating at 180 rpm on a frictionless shaft of negligible radius. The upper disk, of mass 270 g and radius 2.3 cm, is initially not rotating. It drops freely down onto the lower disk, and frictional forces bring the two disks to a common rotational speed. Find (a) that common speed and (b) the fraction of the initial kinetic energy lost to friction.
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