QUESTION THREE Two steel plates have been welded together to form a beam in the shape of a T that has been strengthened by securely bolting to it the two oak timbers shown in Fig. 3. The modulus of elasticity is 12.5 GPa for the wood and 200 GPa for the steel. Knowing that a bending moment M = 50 kNm is applied about a horizontal axis to the composite beam, determine (a) sketch the transformed section with dimensions; the position of the neutral axis (Y) measured from the bottom surface; (b) (c) the second moment of the transformed section; (d) the maximum stress in the oak timber; (e) the stress in the steel along the top edge. oak timber 75 mm 200 mm 20 um steel oak timber 300 mm 20 mm 75 mm Fig. 3 (16 marks)