Discussion
The natural circular frequency of an undamped single-degree-of-freedom system is
Answer: D
From \( \omega_n = \sqrt{k/m} \) the period follows as \( T = 2\pi/\omega_n \). Inverting the ratio inside the root is the most frequent slip, and it makes stiff systems appear slow. Doubling the mass therefore lengthens the period by about forty-one per cent.
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