To help keep her barn warm on cold days a farmer stores 900, Ask an Expert

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To help keep her barn warm on cold days, a farmer stores 900 kg of warm water in the barn. How many hours would a 3.50-kilowatt electric heater have to operate to provide the same amount of heat as is given off by the water as it cools from 20.0 C to 0 C and then freezes at 0 C?

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