a thick plane wall with a thermal conductivity of begin mathsize 14px style text 5 end text straight W over mK end style has reached steady state. The left side is at begin mathsize 14px style text 400K end text end style and the right side is at begin mathsize 14px style text 300K end text end style . Air flows across the right side (i. e. right convection boundary condition). Assume the convection coefficient to be begin mathsize 14px style 100 fraction numerator straight W over denominator straight m squared straight K end fraction end style . What is the air temperature