Homework Help: physics

Posted by Charolett on Sunday, February 10, 2008 at 5:01pm.

If the price of electrical energy is $0.10 per kilo-watt*hour, what is the cost of using electrical energy to heat the water in a swimming pool (12.0m*9.00m*1.5m) from 15 to 27 degree C?

Can anyone please give me some hints to do it? Thanks a lot!

physics - Damon, Sunday, February 10, 2008 at 5:07pm
the heat capacity of water is 4190 Joules/kg deg C

1 meter^3 of water is about 1000 kg

so Joules to heat = 4190 J/kg C*1000 *volume in m^3 * change in temp

a Joule is a watt second

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