An experiment to determine the convection coefficient associated with airflow over the surface of a thick stainless steel casting involves the insertion of thermocouples into the casting at distances of 11 and 22 mm from the surface along a hypothetical line normal to the surface. the steel has a thermal conductivity of 14 w/m·k. if the thermocouples measure temperatures of 51 and 40°c in the steel when the air temperature is 100°c, what is the convection coefficient