7.7 A 2-in.-diameter hole, 5 in. long, is drilled into the center of the top face of a steel cube that is 6 in. on each side. The hole is filled with lead, which has a unit weight of 710 pcf. Locate the center of gravity of the cube with respect to the bottom.

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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.