Conversion of units: A pyramid has a height of 500 ft, and its base covers an area of 15.0 acres (referring to the right figure). The volume of a pyramid is given by the expression V =Bh, where B is the area of the base and h is the height. (a) Find the volume of this pyramid in cubic meters. (1 acre = 43,560 ft also use 1 ft = 3.33 m). (b) Find the volume of the pyramid in terms of cubic centimeter (use 100 cm 1 m, express in scientific notation and Greek prefix if necessary). (c) Express the volume in terms of liters L. (use 1 L= 0.001 m).

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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.