(a) What is the cost of heating a hot tub containing 1540 kg of water from 10.0C to 40.0C, assuming 75.0% efficiency to take heat loss to surroundings into account? The cost of electricity is 9.00/(kW h) and the specific heat for water is 4184 J/(kg C).

(b) What current was used by the 220 V AC electric heater, if this took 4.10 h?

Answer rating: 100% (QA)

a To calculate the cost of heating the hot tub Given Mass of water m 1540 kg Initial temperature T1 ... View the full answer