A cantilever beam AB, loaded by a uniform load and a concentrated load (see figure), is constructed of a channel section. Find the maximum tensile stress σt and maximum compressive stress σc if the cross section has the dimensions indicated and the moment of inertia about the axis (the neutal axis) is l = 3.36in.4

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250 lb 22.5 Ib/ft 5.0 ft-3.0 ft 0.617 in 2.269 in.