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The composite shaft, consisting of aluminum, copper, and steel sections, is subjected to the loading shown

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The composite shaft, consisting of aluminum, copper, and steel sections, is subjected to the loading shown. The cross-sectional areas of sections AB, BC   , and CD are AAB = 0.08 in2 , ABC = 0.14 in2 , and ACD= 0.07 in2 , respectively. The modulus of elasticity for each section are shown in the figure. Neglect the size of the collars at B and C.

Determine the displacement of B with respect to C of the composite shaft. Aluminum Copper Steel Eal 1000) ksi ECU-18(10) ksi Est -29(103) ksi 3.50 kip 1.75 kip 1.50 kip 2.00 kip 50 kip 1.75 kip 18 in 12 in 16 in