You are asked to design a cylindrical steel rod 40.0 cm long, with a circular cross section, that will conduct 150.0 J/s from a furnace at 400.0 C to...

You are asked to design a cylindrical steel rod 40.0 cm long, with a circular cross section, that will conduct 150.0 J/s from a furnace at 400.0 ∘C to a container of boiling water under 1 atmosphere. What must the rods diameter be?