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What is the correct answer?


The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft, and I = Mass moment of inertia of the disc attached at the end of a shaft)

A. 2π. √(q/I)

B. 2π qI

C. (1/2π). √(q/I)

D. 1/2π