One end of a metal cylinder is heated at 17 joules per second (watts) and its other end is water-cooled. The cylinder is insulated to ensure that no heat is lost to the environment. The cylinder has a radius r = 0.022 m. A temperature difference of 2.2 K is measured by 2 thermometers separated by 0.22 m along its length. What is the thermal conductivity of the metal in W m-1 K-12 Do not include units in your answer. Write your answer in exponential form.