When a free-vibration test is run on the system of Figure P4.76, the ratio of amplitudes on
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When a free-vibration test is run on the system of Figure P4.76, the ratio of amplitudes on successive cycles is 2.8 to 1 . When operating, the engine has a rotating unbalance of magnitude \(0.25 \mathrm{~kg} \cdot \mathrm{m}\). The engine operates at speeds between 500 and \(2500 \mathrm{rpm}\). For what value of \(\omega\) within the operating range will the pump's steady-state amplitude be largest? What is the maximum amplitude? Assume the damping is hysteretic.
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