*13-12. The boy having a weight of 80 lb hangs uniformly
Chapter 13, Problem 13-12(choose chapter or problem)
*13-12. The boy having a weight of 80 lb hangs uniformly from the bar. Determine the force in each of his arms in / = 2 s if the bar is moving upward with (a) a constant velocity of 3 ft/s, and (b) a speed of v = (4r) ft/s, where t is in seconds.
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