To use a stress-strain diagram to determine the ultimate stress of a material and to determine the minimum diameters of posts supporting a beam under static loading. As shown, beam ABC is subjected to a load at A that has mass W = 850 kN. The cylindrical posts BD and CE are made of the same material, whose properties are shown in the stress- strain diagram provided. Let a = 9.0 m, b = 5.5 m, r = 5.0 m, and s = 7.5 m. A W D b B E 1200 800 400 (MPa) a more realistic curve 0.10 0.20 0.30 0.40