A pot of water is boiling under one atmosphere of pressure. Assume that heat enters the pot only through its bottom, which is copper and rests on a heating element. In two minutes, the mass of water boiled away is m = 2.5 kg. The radius of the pot bottom is R = 5.0 cm and the thickness is L = 1.0 mm. What is the temperature of the heating element in contact with the pot?