Question

A 3.00 X 10^2- W electric immersion heater is used to heat a cup of water

A 3.00 X 10^2- W electric immersion heater is used to heat a cup of water. The cup is made of glass and its mass is 3.00 X 10^2 g. It contains 250 g of water at 15c. How much time is needed to bring the water to the boiling point? Assume that the temperature of the cup is the same as the temperature of the water at all times and that no heat is lost to the air.

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