A composite rod is made from stainless steel and iron and has a length of 0.50m. The cross section of this composite rod consists of a square within a circle. The square cross section of the steel is 1.0cm on a side. The temperature at one end of the rod is 78 degrees C, while it is 18 degrees C at the other end. Assuming that no heat exits through the cylindrical outer surface, find the total amount of heat conducted through the rod in two minutes.
PLease help me out! thanks a bunch.
2007-04-20 16:42:59 · 2 answers · asked by jamet002 2 in Science & Mathematics ➔ Physics
Ok, let's go on :
H = K*A*(Tw - Tc) / L
L = 0.5
A = pi*1/2 cm^2 = pi*1/2*10^-4 m^2
then :
H = k*pi*1/2*10^-4*(78 - 18) / 0.5
H = 6*k*10^-3
k of the iron is needed
Hope that helps
2007-04-21 03:56:55 · answer #1 · answered by anakin_louix 6 · 0⤊ 0⤋
You need to have some thermal conductivity data on the steel and the radius of the rod. Even with that, this is a differential equation type solution.
2007-04-20 16:47:53 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋