A kg of 40°C water and a kg of 20°C water,after being mixed,have a temperature of 30°C.However,the final temperature of a 1-kg iron block at 40°C placed into 1 kg of water at 20°C is

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When the 40°C water and 20°C water are mixed together, they reach a temperature of 30°C, which is in between their initial temperatures. However, when a 1-kg iron block at 40°C is placed into 1 kg of water at 20°C, heat will flow from the iron to the water until they reach thermal equilibrium. Since the iron block is at a higher temperature than the water, it will transfer heat to the water until they reach a temperature in between 40°C and 20°C. Therefore, the final temperature of the water will be less than 30°C, but closer to 20°C.

A Kg of 40°C Water and a Kg of 20°C