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Question 1 [10 marks) A mild steel rod 6m long and 8cm diameter is subjected to an axial pull of 30kN. If E for steel is 4X105 N/mm². Calculate the following: 1.1 Stress [3] 1.2 Strain [3] 1.3 Elongation of the rod [4] Question 2 [ 35 marks] Figure 1 below shows a built-up section. Calculate the following using BB as reference point. 2.1 The position of the centroid of the section. [5] 2.2 The second moment of area about the horizontal axis and the vertical axis (Ixx and lyy) [15] 2.3 The radius of gyration, rx and ry. [4 2.4 The elastic section modulus, Ze [2] 2.5 The plastic section modulus, Zp [9] 825 mm B 141 mm 1 75 mm 2 166 mm 3 141 mm 291 mm Figure 1