When drilling a hole in a table leg, a furnituremaker uses a hand-operated drill (see figure) with abit of diameter d = 4.0 mm.(a) If the resisting torque supplied by the table leg isequal to 0.3 N ? m, what is the maximum shearstress in the drill bit?(b) If the allowable shear stress in the drill bit is32 MPa, what is the maximum resisting torquebefore the drill binds up?(c) If the shear modulus of elasticity of the steel isG = 75 GPa, what is the rate of twist of the drillbit (degrees per meter)?

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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.