The wide-flange beam is subjected to the 50-kN force. Determine the principal stresses in the beam at point A located on the web at the bottom of the upper flange. Although it is not very accurate, use the shear formula to calculate the shear stress. Solve Prob. 9-40 for point B located on the web at the top of the bottom flange. A 1 m A₁ 12 mm 10 mm- 250 mm 200 mm 12 mm 3 m 50 kN