Problem 5 State of Stress Caused by Combined Loading, Stress Transformation (20pts) 1) Determine the state of stress at points A and B on the cross section of the shaft at section a-a and show the results in an element for each point (10 points). 2) Determine the principal stresses and maximum in-plane shear for each point using Mohr's circle method (10 points). Show all steps and "clear" free body diagrams. Indicate the center, radius, reference point, and principal stresses in each circle. Z 200 mm 500 mm B 13 kN 400 mm B 15 kN 50 mm 13 kN Section a-a 6 kN