At room temperature (20C), a 0.5-mm gap exists between the ends of the rods shown. The temperature eventually reaches a value of 140C. 300 mm Aluminum A = 2000 mm E = 75 GPa a = 23 x 10-6/C 0.5 mm - 250 mm Stainless steel A = 800 mm B E = 190 GPa a = 17.3 x 10-6/ Determine the normal stress in the aluminum rod. The normal stress in the aluminum rod is MPa.