Consider a small pot with an aluminum base. The base has a thickness of 2.0mm and a diameter of 21 cm. Water in this pot is boiling at 100. 0C. Heat transfer rate is estimated at 250,000 J/s. Assume that heat enters the water only from the bottom of the pot through the aluminum base. Find the temperature of the heating element on which the aluminum bottom rests to 3 sig fig.

Table 13.1 Thermal Conductivityes of Selected Materials Thermal Conductivity, k Substance [J/(s . m . Co)] Metals Aluminum 240 Brass 110 Copper 390 Iron 79 Lead 35 Silver 420 Steel (stainless) 14 Gases Air 0.0256 Hydrogen (H2) 0.180 Nitrogen (N2) 0.0258 Oxygen (02) 0.0265 Other Materials Asbestos 0.090 Body fat 0.20 Concrete 1.1 Diamond 2450 Glass 0.80 Goose down 0.025 Ice (0 .C) 2.2 Styrofoam 0.010 Water 0.60 Wood (oak) 0.15 Wool 0.040 Except as noted, the values pertain to temperatures near 20 .C