A laminated plastic beam of square cross section is built up by gluing together three strips, each 10 mm x 30 mm in cross section (see figure). The beam has a total weight of 3.6 N and is simply supported with span length L = 360 mm.
Considering the weight of the beam (q) calculate the maximum permissible CCW moment M that may be placed at the right support.
(a) If the allowable shear stress in the glued joints is 0.3 MPa.
(b) If the allowable bending stress in the plastic is 8 MPa.

10 mm t10 mm 30 mm t 10 mm I-I 30 mm