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Q. A composite bar made from two different materials of equal cross-sectional areas are directly attached to each other making the bar a length of L = L1 + L2.The coefficient of thermal expansion for the two materials are x1 and x2 correspondingly. Suppose the cross-section of each bar is unaffected by the heating and determine the effective coefficient of linear expansion for composite bar x in terms of L1, L2, x1, and x2.

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