A 50-kg turbine is mounted on four parallel springs, each with a stiffness of (3 times 10^{5}

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A 50-kg turbine is mounted on four parallel springs, each with a stiffness of \(3 \times 10^{5} \mathrm{~N} / \mathrm{m}\). When the machine operates at \(40 \mathrm{~Hz}\), its steady-state amplitude is observed as \(1.8 \mathrm{~mm}\). What is the magnitude of the excitation?

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