Solve: Modulus of Elasticity Elongation of The Cable

2.29 A homogeneous cable of length l and uniform cross section is suspended from one end. (a) Denoting by  r the density (mass per unit volume) of the cable and by E its modulus of elasticity, determine the elongation of the cable due to its own weight. (b) assuming now the cable to be horizontal, determine the force that should be applied to each end of the cable to obtain the same elongation as in part a

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