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Question 1 (7.5 marks) A plastic bar ACB having two different solid circular sections is held between rigid supports as shown in the figure. The diameters in the left- and right-hand parts are 50 mm and 75 mm, respectively. The corresponding lengths are 230 mm and 320 mm. The modulus of elasticity E is 6 GPa & the coefficient of thermal expansion a is 10-4 °C. The bar is subjected to uniform temperature increase of 30°C. Determine: i. maximum compressive stress in the bar. ii. displacement of point C. Express your answer with the appropriate units. 75 mm diameter 50 mm diameter с B А 230 320 All dimensions in mm