18-42 - 1842 The system consists of a 20-lb disk A 4-lb...

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18–42. The system consists of a 20-lb disk A , 4-lb slender rod BC , and a 1-lb smooth collar C . If the disk rolls without slipping, determine the velocity of the collar at the instant . The system is released from rest when . u = 45° u = 30° SOLUTION Thus, Thus, A n s . v C = 2.598(1.180) = 3.07 ft > s v BC = 1.180 rad > s + 1 2 a 1 32.2 b (2.598 v BC ) 2 + 4(1.5 sin 30°) + 1(3 sin 30°) + 1 2 c 1 12 a 4 32.2 b (3) 2 d v BC

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