Question 2 (10 marks) A punch for making holes in steel plates is shown in Figure 2(a). Assume that a punch having a diameter of 20 mm is used to punch a hole in a 8 mm thick plate, as shown in the cross-sectional view [see Figure 2(b)]. If a force P = 150 kN is required, what is the average shear stress in the plate and the average compressive stress in the punch? P (a) Fig. 2 d P (b) 17