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To help keep her barn warm on cold days, a farmer stores 810 kg of warm...

To help keep her barn warm on cold days, a farmer stores 810 kg of warm water in the barn.

How many hours would a 4.00-kilowatt electric heater have to operate to provide the same amount of heat as is given off by the water as it cools from 22.0 ∘C to 0 ∘C and then freezes at 0 ∘C?

t=????HOURS

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