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Consider a bimetallic strip consisting of a 0.6-mm-thick brass upper strip welded to a 0.6-mm-thick steel lower strip. When the temperature of the bimetallic strip is increased by 83 K, the unattached tip deflects by 3 mm from its original straight position, as shown in the figure. What is the length of the strip at its original position? (The linear expansion coefficients for brass and steel are 1.90 10-5 °C−1 and 1.30 10-5 °C−1, respectively.)

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