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A copper strip $(E_C=105$GPa $)$ and an aluminum strip $(E_a=75$GPa $)$ are bonded together to form the composite beam shown. Knowing that the beam is bent about a horizontal axis by a couple of moment $M=37N*m,$ determine the maximum stress in the aluminum strip and in the copper strip.

The maximum compressive stress in the aluminum strip is $$ MPa $($include a negative sign$).$ The maximum tensile stress in the copper strip is

MPa $.$