A shaft is made of an alloy steel that has an allowable shear stress of ????? = ?????. If the diameter of the shaft is 1.5in. Determine the maximum torque T that can be transmitted and What would be the maximum torque T' if a 1in diameter hole were drilled through shaft.

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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.