Circular copper rods of diameter d=1mm and length l=25mm areused to enhance heat transfer from a surface that is maintained atts,1=100 deg. c. one end of the rod is attached tothis surface (at x=o), hile the other end (at x=25mm) is joined toa second surface that is maintained at ts,2=0deg. c. air flowing between the surfaces (and over the rods)is also at a temperature t? = 0 deg. c, and has a convectioncoefficient of h=100 w/m2kelvin.

a. what is the rate of heat transfer by convection from a singlecopper rod to air?
b. what is the total rate of heat transfer from a 1 m x 1 m section of the surface at 100 deg. c, if a bundle of the rods is installed on 4-mm centers?