Disk D turns with a constant clockwise angular velocity of 30 rad/s. Disk E has a weight of 60 lb and is initially at rest when it is brought into contact with D. Determine the time required for disk E to attain the same angular velocity as disk D. The coefficient of kinetic friction between the two disks is μ_k = 0.3. Neglect the weight of bar BC.

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2 ft C -2 ft 1 ft 1 ft B A E D w = 30 rad/s