(a) What is the cost of heating a hot tub containing 1510 kg of water from 10.0°C to 40.0°C, 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 4.95 h? Additional Materials O Reading

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