Three bars, each made of different materials, are connected together and placed between two walls when the temperature is T₁ = 12°C. Determine the force exerted on the (rigid) supports when the temperature becomes T₂ = 18°C. The material properties and cross-sectional area of each bar are given in the figure.

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Steel Est=200 GPa Brass Ebr -100 GPa ast = 12(106)/C abr 21(10-6)/C = Ast 200 mm Abr = 450 mm Copper = Ecu - 120 GPa acu = 17(10-6)/C Acu = 515 mm -300 mm -200 mm- 100 mm