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(a) Torsional amplitude of vibration is given by:
theta=To/sqrt((Kt-Jw2)^2+(Ct*w^2)^2)
theta=0.3334 rad
(b) Maximum damping couple= Ct*w*theta = 0.5334 N-m
(c)Phase angle phi =
tan(phi)=(Ct*w)/(Kt-J*w^2)
phi=117.248 degrees
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