A hollow box beam is constructed with webs of Douglas-fir plywood and flanges of pine, as shown
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(a) If the allowable stresses are 2000 psi for the plywood and 1750 psi for the pine, find the allowable bending moment Mmax when the beam is bent about the z axis.
(b) Repeat part a if the b.eam is now bent about its y axis.
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