This stepped bar is placed between two rigid walls, with a 0.002-inch gap between the right end and the right wall before the 10,000-pound load is applied at a temperature of 40 degrees F. Find the stresses in both materials when the load is applied and the temperature is raised to 80 degrees F. For aluminum, use E = 10 X 105 psi and a = 13 x 10-6 1/F. For steel, use E = 30 X 105 psi and a = 8 X 106 1/F. (Answer: -6777 psi and -3553 psi) k Aluminum Area = 2 in 18 in 10,000 lb B Steel Area = 1 in 24 in Gap = 0.002 inches