The electric motor exerts a torque of 800N*m on the steel shaft ABCD when it rotates at a constant speed. Design specifications require that the shaft diameter is uniform from A to D and that the angle of twist between A and D does not exceed 1.5°. If it is known that the maximum shear must be less than or equal to 60MPa and G=77GPa. Determine the diameter which can be used for the axis. The figure is in the attached image

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Torsion

In mechanical engineering, torque, torsion, and twisting moment are three of the most important concepts which have different meanings. Torque is the consequence of a moment of a force that produces an angular acceleration in a body or induces rotational kinetic energy in a body. For instance, in an automobile, the power transmission shaft is a body that is always under rotation due to the external torque acting on it, this torque is created by the engine.