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A steel rod with cross sectional area of 150 mm2 is stretched between two fixed points. The tensile load at 20C is 5000N, the

A steel rod with cross sectional area of 150 mm2 is stretched between two fixed points. The tensile load at 20C is 5000N, the coefficient of thermal expansion a=11.7um/(m.C) and modulus of elasticity E=200x10 N/m2. What will be the thermal stress on the rod at -20C ?

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