An uninsulated steam pipe passes through a room in which the air and surrounding walls are at25◦c. the outside diameter of the pipe is 70mm, and its wall temperature and emissivity are200◦cand 0.8, respectively. the heat transfer coefficient associated with the free convection heattransfer from the wall to the air is 15w/m2·k. a)what is the wall emissive power. b)what is the rate of heat loss from the wall per unit length of pipe by radiation? c)what is the total rate of heat loss from the wall per unit length of pipe by radiation and freeconvection? d)calculate an approximate radiative heat transfer coefficient based on the wall temperature. basedon this approximated radiative heat transfer coefficient what would be the approximate radiativeheat loss from the wall to the surroundings? e) repeat part (d) by calculating an approximate radatve heat transfer coefficient based on theaverage temperature, taverage= [tw+tsur]/2. any comments? note that of if we had forced convection, the forced convection heat transfer could be much largerin magnitude than the free convection and radiative heat transfer. (hint: tsur=tair=t[infinity])