3. (20 points) Consider the composite beam illustrated in fig. 3. The beam is comprised of wood and steel, as shown in the cross-section view, along with the dimensions. Assume that Ewood = 15 GPa and Estool=240 GPa. (a) Determine the maximum normal stress in the wood, due to the loading shown. (b) Indicate the location of the maximum stress in the wood. 100 N/m I 5m Figure 3 Solution: (a) (50, -25) = -3.719 kPa, (-50, 25) = 3.719 kPa. (b) Bottom left and top right corners of wood section. 100 mm Steel Wood 215 mm 120 mi 30 mm 50 mm mm