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18–46. The 12-kg slender rod is attached to a spring, which has an unstretched length of 2 m. If the rod is released from rest when u = 30°, determine the angular velocity of the rod the instant the spring becomes unstretched.

2 m

*18–44. Determine the speed of the 50-kg cylinder after it B
has descended a distance of 2 m, starting from rest. Gear A
has a mass of 10 kg and a radius of gyration of 125 mm about its center of mass. Gear B and drum C have a combined mass of 30 kg and a radius of gyration about their center of mass of 150 mm.

A u
2 m

k = 40 N/m

Prob. 18–46

150 mm


200 mm

100 mm

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