The beam is subjected to a moment of M=40 kN⋅m. Determine the bending stress - 6-62

6-62. The beam is subjected to a moment of M=40 kN⋅m. Determine the bending stress at points A and B. Sketch the results on a volume element acting at each of these points
All problems from Mechanics of Materials Eleventh Edition by Russell C. Hibbeler.