# Homework Help: I really need help

1. Sep 17, 2008

### ms-mk

can sombody please help me, im a high school student and i really need help on this question

The diagram below show a cross-section view of a sheet of metal (of thermal conductivity, k) covered on each side by a layer of plastic of thermal conductivity k/1000. The lower face of the plastic is maintained at a steady temperature, T4 = 150°C. The top surface is maintained at a steady temperature, T1 = 20°C. Calculate the temperatures of the surfaces of the metal, T2 and T3. Assume that the heat lost through the sides of the metal (and plastic) is negligible.

i think I'v attacked the diagram

if anyone can, it would be really appriciated

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• ###### physics.bmp
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2. Sep 17, 2008

### Integral

Staff Emeritus
You need to show us that you have but some effort into this problem.

What equations do you know of that might help?

3. Sep 18, 2008

### ms-mk

hey, i figured it out!! used the k=Rd/((T2-T1)A) formula, the R, A and K cancelled out
thanks anyway
ciao