Discussion
A system has a mass of 4000 kg and a stiffness of 1600 kN/m. Its natural period is closest to
Answer: A
The natural frequency is the square root of 1 600 000 divided by 4000, which is 20 rad/s, and the period is 2 pi over 20, about 0.31 seconds. Forgetting the factor of 2 pi gives roughly 0.05, and confusing frequency with period gives the others.
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