A cantilever beam AB, loaded by a uniform load and a concentrated load (see gure), is constructed of a channel section. (a) Find the maximum tensile stress st and maximum compressive stress s c if the cross section has the dimensions indicated and the moment of inertia about the z axis (the neutral axis) is 3.36 in4 I 5 . Note: The uniform load represents the weight of the beam. (b) Find the maximum value of the concentrated load if the maximum tensile stress cannot exceed 4 ksi and the maximum compressive stress is limited to 14.5 ksi. (c) How far from A can load P 5 250 lb be positioned if the maximum tensile stress cannot exceed 4 ksi and the maximum compressive stress is limited to 14.5 ksi