A copper sheet of thickness 3.90 mm is bonded to a steel sheet of thickness 4.40 mm. The outside surface of the copper sheet is held at a temperature of 170.0 °C and the steel sheet at 34.0 °C. (The thermal conductivity is 386 W/(m K) for copper and 16.3 W/(m K) for steel.) (a) Determine the temperature of the copper–steel interface. = °C (b) How much heat is conducted through 1 m2 of the combined sheets per second? = W