A wood beam with cross-sectional dimensions 200 mm X300 mm is reinforced on its sides by

steel plates 12 mm thick (see figure). The moduli of elasticity for the steel and wood are E,

=190 GPa and Ew=11 GPa, respectively. Also, the corresponding allowable stresses are o

=110 MPa and ow=7.5 MPa.

1. Calculate the maximum permissible bending moment Mmax when the beam is bent

about the z axis.

2. Repeat part 1 if the beam is now bent about its y axis