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    Finding Magnification factor M for Frequency Ratio

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    1) In the idealized model attached shown, m = 15 kg, k = 135 N/m, and the viscous damping ratio is 0.15. Assume that an external harmonic force F(t) = 15 cos 4 t acts on the system with F0=15 N and forcing frequency of 4 rad/s.
    i) Find the magnification factor M for the frequency ratio r of 1.382.
    ii) What is the amplitude of the response X?

    For i ), which one is correct answer:
    (a) 4
    (b) 3
    (c) 1

    For ii ), which one is correct answer:
    (a) 0.127
    (b) 0.184
    (c) 0.274

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    Solution Summary

    The solution finds the magnification factor M for frequency ratio. The amplitude of response X is determined.