A25-cm diameter rod is suspended horizontally in quiescent (still) air that is at 50°c. the rod is 250 cm long and is maintained at a temperature of 35°c. determine the average heat transfer coefficient for the rod.

An electrical kettle is made out of stainless steel,weighs two pounds (when empty) with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling.