To help keep her barn warm on cold days, a farmer stores775 kg of warm water in

Question

To help keep her barn warm on cold days, a farmer stores775 kg of warm water in the barn. How manyhours would a 2.00 kilowatt electric heater have to operate toprovide the same amount of heat as is given off by the water as itcools from 15.0°C to 0°C and thenfreezes at 0°C?

________?hours To help keep her barn warm on cold days, a farmer stores775 kg of warm water in the barn. How manyhours would a 2.00 kilowatt electric heater have to operate toprovide the same amount of heat as is given off by the water as itcools from 15.0°C to 0°C and thenfreezes at 0°C?

________?hours

Explanation / Answer

We know that :                     t   = m [ Cwater ( 15.0 ) + Lf ] / P                         = 775 [4186 J / kg .K ( 15 ) + 33.5 x 104 ] / 2 x 103                                                 = 154,143 s                         = 42.8 h Hope this helps u!

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