If a rod of single-crystal copper (FCC) is pulled in tension in the [210] direction (i.e. force direction) at a tensile stress of 50 MPa, slip will occur in the [0 1 1] direction on the (1 1 -1) plane. Use this information to answer the following questions. Which of the following is the value of cos(lambda) for the angle lambda between the force direction and the slip direction?

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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.