Question
45 g of water at 50∘C in a beaker is cooled when 50 g of copper at 18∘C is added to it. The contents are stirred till final constant temperature is reached. Calculate the final temperature. The specific heat capacity of copper is 0.39 Jg−1K−1 and that of water is 4.2 Jg−1K−1. State the assumption used.