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two rods made of copper and iron have equal lengths of 1.2 m when measured at a temperature of 200c. the rods are cooled down

two rods made of copper and iron have equal lengths of 1.2 m when measured at a temperature of 200c. the rods are cooled down so that the difference between the lengths is 0.2 mm. find the temperature of cooling. coefficients of copper and iron are 1610 and 1110 K

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