Cables OA, OB, OC, and the vertical cable, knotted at O, support the 108lb weight. Cables OA and OB lie in the x-y plane. Sketch a complete free body diagram knot at O. Select the expression that describes the tension in cable OC, acting at O, as a Cartesian vector. a. - 3/13 Toc i + 4/13 Toc j + 12/13 Toc k b. 3/5 Toc i + 4/5 Toc j c. -Toc j d. - 3/13 Toc i + 12/13 Toc j + 4/13 Toc k

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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.