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Mechanical Vibration Analysis

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For this two degree fo freedom model, how do I find the matrix equation of motion?
How do I find the value of the modal ratios if m1=m2=m, k1=k and k2=3k?
If a force of 25sin3t is applied to m2, how do I find the value of the response if m1=m2=1 slug, k1=10lb/ft and k2=30lb/ft?

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Mechnical Vibration Analysis

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