Problem No. 4 (Figure 4) (a) Draw shear force diagram, bending moment diagram for the beam as shown in Figure 4. (b) Determine flexural stresses for maximum positive and negative bending moments. (c) Also, sketch the distribution of flexural stresses for maximum positive and negative bending moments. Figure 4. 400 lb 400 lb 200 lb/ft -3 ft -6 ft 6" K 2" B 2" 10" 3 ft