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Disks A and B are mounted on shaft SS and may be connected or disconnected by clutch C. (See Figure 10.78.) Disk A is made of a lighter material than disk B, so the moment of inertia of disk A about the shaft is one-third that of disk B. The moments of inertia of the shaft and clutch are negligible. With the clutch disconnected, A is brought up to an angular speed ω0. The accelerating torque Is then removed from A, and A is coupled to disk B by the clutch. (You can ignore bearing friction.) It is found that 2400 J of thermal energy is developed in the clutch when the connection is made. What was the original kinetic energy of disk A?
Figure 10.78
Problem 66.
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