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All members of the steel truss have the same cross-sectional area. If the truss is stress-free at 10C, determine the stresses in the members

All members of the steel truss have the same cross-sectional area. If the truss is stress-free at 10C, determine the stresses in the members at 90C. For steel, x = 11.7 x 10-6/C and E = 200 GPa. A 30 # 3 m B D 30 + 3 m C

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