Question: A plastic bar of diameter d = 56 mm is to be twisted by torques T (see figure) until the angle of rotation between the

A plastic bar of diameter d = 56 mm is to be twisted by torques T (see figure) until the angle of rotation between the ends of the bar is 4.0°.
If the allowable shear strain in the plastic is 0.012 rad, what is the minimum permissible length of the bar?

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