The system shown above is released from rest. The rotational inertia of the pulley and the axle assembly are negligible. A solid uniform disk of mass 0.6 kg and radius 0.27 m is attached to the axle, and an annular disk of mass 0.7 kg, inner radius 0.12 m, and outer radius 0.15 m is attached to the solid disk. As the hanging mass falls, the tension in the string causes the axle, disk, and annular disk rotate. The string is wrapped around a section of the 3-stage spool that has a diameter of 2.8 cm. When the hanging mass of 0.6 kg has fallen 0.8 m, what is the kinetic energy of (a) the solid disk, (b) the annular disk, and (c) the hanging mass? (Assume there is no kinetic friction in the system.)
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