1.

A vibrating system with mass 3 kg, stiffness 21 N-s/m and damper having damping coefficient 10 N-s/m. When an exciting force of magnitude 27 sin 2t is acting, what would be the time period of oscillations?

A. 0.78 s
B. 1.56 s
C. 3.14 s
D. 3.89 s
Answer» D. 3.89 s


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