Discussion
If the natural period of a structure is 0.8 s, its natural frequency is
Answer: D
Taking the reciprocal gives \( 1/0.8 = 1.25 \) Hz. Confidence in moving between period and frequency is worth having, since codes and instruments use both. The circular frequency of the same system is \( 2\pi/0.8 = 7.85 \) rad/s.
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