The cross section of a beam made of thin strips of aluminum separated by a lightweight plastic is shown in the figure. The beam has width b = 3.0 in., the aluminum strips have thickness t = 0.1 in, and the plastic segments have heights d = 1.2 in. and 3d = 3.6 in. The total height of the beam is h = 6.4 in. The moduli of elasticity for the aluminum and plastic are Ea = 11 x 106 psi and Ep = 440 x 103 psi, respectively.
Determine the maximum stresses σa and σp in the aluminum and plastic, respectively, due to a bending moment of 6.0 k-in.

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T4