The cross-section of a composite beam made of aluminium and steel is shown in the figure. The moduli of elasticity are E_{a)} = 75GPA and E_{s} = 200 GPa. Under the action of a bending moment about z-axis that produces a maximum stress of 50 MPa in the aluminium, what is the maximum stress o in the steel? %3D Aluminium Steel 30 mm ww 08

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