The steel shaft of a socket wrench has a diameter of 8.0 mm. and a length of 200 mm (see figure). If the allowable stress in shear is 60 MPa, what is the maximum permissible torque Tmax that may be exerted with the wrench?
Through what angle ( (in degrees) will the shaft twist under the action of the maximum torque? (Assume G = 78 GPa and disregard any bending of the shaft.)

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Id=8.0 mm L = 200 mm