Use the general theory for solving these composite beams problems.

NB: Don't use transformation method here!!

Question $1[20]$

A composite beam $($shown in the figure below$)$ is constructed from a wood beam and a steel reinforcing plate. The wood and steel are securely fastened to act as a single beam. The beam is subjected to a positive bending moment of $50kN-m.$ Calculate the largest tensile and compressive stresses in the wood $($material $1)$ and the maximum and minimum compressive stresses in the steel $($material $2)$ if $E_1=10$ GPa and $E_2=207$GPa.

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