A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thickness of t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in aluminum to that in copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
(B) 0.8
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