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Question 4 (20%) (1) A thin-walled beam having a unifom wall thickness of 10 mm is subjected to a bending moment V = 50 kN-m, as shown in Figure 4(a). Determine the bending stress of point Hand also locate the neutral axis. 2) If a downward shear force P = 100 kN is applied on the beam through the centroid of the cross-section as shown in Figure 4(b), plot the shear stress distribution on the cross-section. 160 H н 10 C Z 100 12 M 45° 100 100 Dimension unit: mm (a) 160 V 10 100 100 100 Dimension unit: mm