Solve Problem 15.6 using a computer program.
For the plane truss shown in Figure P15 -6, bar element 2 is subjected to a uniform temperature drop of T = 30°C. Let E = 70 GPa, A = 4 × 10-2 m2, and a = 23 × 10-6 (mm/mm)/°C. Determine the stresses in each bar and the displacement of node 1.

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2, 3 m 30° 30°