INITIALS: Problem 2: A bar ACB having two different solid circular cross sections is held between rigid supports as shown in the figure. The diameters of segments AC and CB are 50 mm and 75 mm, respectively. The corresponding lengths are 225 mm and 300 mm. The modulus of elasticity E = 6.0 GPa, and the coefficient of thermal expansion a is 100 x 10-6/°C. The bar is subjected to a uniform temperature increase of 30°C. Find: (a) the compressive force Nc in the bar due to the increase in temperature (b) the maximum compressive stress A 150 mm C 75 mm B -225 mm Some 300 mm- U₁ = SAB = d= + Sp a (AT)L +2 4E