Two identical thin metal strips, one of aluminum and the other of iron are riveted together to form a bimetallic strip. The temperature is raised by 50º C. If the central planes of the two strips are separated by 2mm and the coefficients of thermal expansion of aluminum and iron are respectively 30 × 10 –6 / 0 C and 10 × 10 –6 / 0 C the average radius of curvature of the bimetallic strip is about.
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