Three steel rods (E = 29 × 106 psi) support an 8.5-kip load P. Each of the rods AB and CD has a 0.32-in2 cross-sectional area and rod EF has a 1-in2 cross-sectional area. Neglecting the deformation of bar BED, determine (a) the change in length of rod EF, (b) the stress in each rod.
Fig. P9.29

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