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A swimming pool heater has to be able to raise the temperature of the 50,000 gallons of water in the pool by 9.0 C. How many kilowatt-hours of energy are required? (One gallon of water has a mass of approximately 3.8 kg and the specific heat of water is 4,186 J/kg C.)
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Added Mon, 22 Jun '15
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Q=mCdT
   =(50000*3.8)*4186*9=7158060000 J

E=Q/t=Q/3600

On solving we get E=19880 KWh 
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Added Mon, 22 Jun '15
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