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A concentrated force F = 100 kN is applied on a simply supported beam as shown in the figure (a). Figure (b) shows the beam cross section. What is the shear stress at point B of the cross section 7 (see the dash line in the Figure (a) for the location of the cross section 7)? F KN 10 mm C B A- A 1200mm 1000mm 40 mm 30 mm 10 mm (a) B 40 mm 10 mm 30 mm 10 mm (b)