A steel cylinder of radius 5.5cm and length 4.6cmis placed in end-to-end thermal contact with a copper cylinder of the same dimensions.
If the free ends of the two cylinders are maintained at constant temperatures of 93?C (steel) and 28?C(copper), how much heat will flow through the cylinders in 25 min? Assume ksteel=46J/(m?s??C) and kcopper=390J/(m?s??C).