Consider high, long, and thick wall whose cross section is given in figure. Thermal conductivities of various materials used, in , are

, , , , and . The left surface of wall is maintained at

and right surface of wall is subjected to convection with outdoor temperature

and . Assuming heat transfer through wall is one-

dimensional, determine (a) heat transfer rate through wall; (b) temperature at point

where sections , , and meet; and (c) temperature drop across section ; d) right

wall surface temperature. Disregard any contact resistances at interfaces.