Hot air at 60°c leaving the furnace of a house enters a 12-m-long section of a sheet metalduct of rectangular cross section 20 cm x 20 cm at an average velocity of 4 m/s. thethermal resistance of the duct is negligible, and the outer surface of the duct, whoseemissivity is 0.3, is exposed to the cold air at 10°c in the basement, with a convectionheat transfer coefficient of 10 w/m2°c. taking the walls of the basement to be at 10°calso, determine (a) the temperature at which the hot air will leave the basement and (b)the rate of heat loss from the hot air in the duct to the basement