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The 135-lb platform A is attached to springs B and D, each of which has a constant k=120 lb/ft. Knowing that the frequency of

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Solution Initially the system is . given mass of platform A A ma = 135-eb B eu constant of B and D spring KB = KD 120 16/4+ -as given frequency remains unchanged F : +2 1 40 1 240tKC 는 이동 &n 135 n 15 Cm 440 240 + KC 는 135 IS kc = ?IS X 240 - 240 135

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