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Ok, my book is seriously lacking in the example department, and we have only gone through derivations in class, no examples yet.

I understand that this is a conduction problem so I am to use fouriers law

q=-kA dT

dx

k= 202 W/mC for Al

Now the tricky part, I know that the problem that I face is that the area changes along the axis. Am I just to integrate:

pi r^2 from 3.25cm to 6.25cm, then multiply that by (540-93)/.3?

Thanks