The assembly shown below consists of three rods AB, CD and EF with the following properties: AB and CD: Modulus of elasticity = 75 GPa; Diameter = 35 mm EF: Modulus of elasticity = 200 GPa; Diameter = 20 mm If there is a 0.5 mm gap at A and C before loading, Determine the average normal stress developed in rods AB, CD and EF. [25] Note: The cap GH is rigid. 0.5 mm K-250 mm>I H 500 mm 75 kN . 35 mm E F 20 mm 75 kN C, D 35'mm G 777///