For the one-dimensional steel bar fixed at each end and subjected to a uniform temperatu...

For the one-dimensional steel bar fixed at each end and subjected to a uniform temperature drop of T = 20 ° C as shown in Figure P15–2, determine the reactions at the fixed ends and the stress in the bar. Let E = 210 GPa, A = 1 × 10^–2 m², and α = 11.7 × 10^–6 (mm/mm)/ ° C.