A system with an equivalent mass of (30 mathrm{~kg}) has a natural frequency of (120 mathrm{rad} /

Question:

A system with an equivalent mass of $30 \mathrm{~kg}$ has a natural frequency of $120 \mathrm{rad} / \mathrm{s}$ and a damping ratio of 0.12 and is subject to a harmonic excitation of amplitude $2000 \mathrm{~N}$ and frequency $150 \mathrm{rad} / \mathrm{s}$. What are the steady-state amplitude and phase angle of the response?

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