The beam has a rectangular cross-section and is subjected to the loadings shown in Figure 3. Points A and B are located just to the left of the 20-kN load. a) Determine the normal and shear stresses at point B. Show the results on element located at this point. (10 marks) b) Draw the Mohr's circle for the stress state of point B. (10 marks) c) Determine the principal stresses at point B. Show the principal stresses on element located at this point with the corresponding orientation. (7.5 marks) d) Determine the maximum shear stress and the corresponding normal stress at point B. Show the maximum shear stress and the corresponding normal stress on element located at this point with the corresponding orientation. (7.5 marks) 2 m 20 kN 100 mm .B A 10 kN B 100 mm 100 mm A 2 m Figure 3 50 mm 50 mm