H.14: A bimetallic strip, with a cross section shown below, is used as a sensing element in a thermostat. The strip is made of copper (Ec= 120 GPa) and nickel (En= 210 GPa) that are bonded together to form a beam. The beam is subjected to a bending moment of Mz= +2 N-m about the z-axis (i.e. neutral axis). Calculate the maximum bending stress (a) in the copper and (b) in the nickel. Also, indicate whether each stress is tension or compression.
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