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10.45g of water at 50 C in a beaker is cooled when50 g of copper at 18°C is added to it. The contentsare stirred till a final constant temperature is reached.Calculate the final temperature. The specific heatcapacity of copper is 0.39 J g K-1 and that of wateris 4.2 J g-1 K-1. State the assumption used.Ans. 47oc

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