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a 1-mm-thick copper plate (k 5 386 w/m·k) is sand- wiched between two 5-mm-thick epoxy boards (k 5 0.26 w/m·k) that are 15 cm 3 20 cm in size. if the thermal contact conductance on both sides of the copper plate is estimated to be 6000 w/m·k, determine the error involved in the total thermal resistance of the plate if the thermal contact conductances are ignored.

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