A square copper bar has length, Lo, of 762 mm and side length, ao, of 37 mm at room temperature (23 "C). It is placed in front of a wall set to be 0.19 mm apart. If the temperature of the bar is then increased by 61 "C, determine the applied force on the bar Assume the modulus of elasticity, B, is 117 GPa and coefficient of thermal expansion, a, is 17 x 106PC Note: rounded the answer to a maximum of 2 decimal places Lo