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how much time is required to raise the temperature of the water from

A family comes home from a long vacation with laundry to-do and showers to take. The water heater has been turned off during the vacation. If the heater has a capacity of 50.0 gallons and a4800 W heating element, how much time is required to raise the temperature of the water from 20.0°Cto 55.0°C? Assume that the heater is well insulated and no water is withdrawn from the tank during that time.

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