Determine the maximum tensile stress st and maximum compressive stress s c due to the load P acting on the simple beam AB (see gure). (a) Data are P 5 6.2 kN, L 5 3.2 m, d 5 1.25 m, b 5 80 mm, t 5 25 mm, h 5 120 mm, and h1 5 90 mm. (b) Find the value of d for which tensile and compressive stresses are the largest. What are these stresses