1. The problem statement, all variables and given/known data In a domestic heating system, a room is warmed by a 'radiator' through which water passes at a rate of 0.12kg s-1. The steady-state difference between the inlet and outlet temperatures of the water is 6.0 K. The radiator is made of iron of thermal conductivity 80 W m-1 K-1 and has an effective surface area of 1.5 m2 with walls 2.0 mm thick. (a) At what rate is heat supplied to the room? (b) What is the mean temperature difference between the inner and outer surfaces of the radiator walls? [Specific heat capacity of water = 4.2 x 103 J kg-1 K-1] 2. Relevant equations a)q/t = k a ΔT / L is it true use this equations? b) q = m c ΔT 3. The attempt at a solution a) i put all the data to the formula, but the answer is 360000 w my teacher give me the answer is 3024 w which one is true?