A small 40-lb block A is attached to the rod BC of negligible mass which is supported
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A small 40-lb block A is attached to the rod BC of negligible mass which is supported at B by a pin and bracket and at C by a spring of constant k = 140 lb/ft. The system can move in a vertical plane and is in equilibrium when the rod is horizontal. The rod is acted upon at C by a periodic force P of magnitude P = Pm sin ωft where Pm = 1.4 lb. Knowing that b = 8 in., determine the range of values of ωf for which the amplitude of vibration of block A exceeds 0.14 in.
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B n 8m 291 b kl mb m O 014 in 8 in mb l Mg mb k0 Pl s...View the full answer
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