Problem 3. A laminated plastic beam of square cross section is built up by gluing together three strips, each 10 mm 30 mm in cross section. The beam has a total weight of 4 N and is simply supported with span length L the weight of the beam (q) calculate the maximum permissible moment M that may be placed at the right support, 10 mm 10 mm 30 mm 10 mm M 400 mm. Considering %3D 30 mm (a) If the allowable shear stress in the glued joints is 0.5 Mpa, and (a) If the allowable bending stress in the plastic is 10 Mpa.