Your client asks you to construct an accent for his house. You use an iron wire, 0.75m long and 2.75x10^-3 cm^2 in cross - cube of mass 8 kg on one end. On the bottom of the brass cube, you attach a sectional area, and hang a brass similar iron wire and hang another brass cube of mass 7.5 kg. If Young's Modulus of Elasticity for iron is 21x10^10 Pa and that the weight of the iron wires is neglected. For the wire above, determine: (a) tensile stress, (b) the tensile strain, and (c) the elongation.

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Helmholtz Free Energy

The Helmholtz free energy is a thermodynamic potential used to calculate the measure of useful work from a closed system. This system is kept at constant temperature and volume. German physicist Hermann Helmholtz introduced this concept in 1882.