How Do I Calculate Heat Transfer by Conduction Using Thermal Conductivity?

[Bolter]

Homework Statement

Working out rate of heat transfer

Relevant Equations

fourier's law

Can anyone please guide me in what I'm missing to answer part b)i?

I can't seem to work out the thermal conductivity (k) in order to find the heat transfer by conduction? Or is the different approach that I must take to do this question?

Thanks for any help!

 

[Cutter Ketch]

They tell you the rod is made of copper.

 

[Bolter]

They tell you the rod is made of copper.

Ok right. But does the question expect of me to know copper's thermal conductivity? Or is there a way to calculate this from knowing that the material we're dealing with is copper?

I looked up on wikipedia in a table that the thermal conductivity of pure copper is 401 W/mk

 

[gneill]

Ok right. But does the question expect of me to know copper's thermal conductivity?

If the question is from a textbook, you may find that they include one or more tables in the back of the book...

 

[Bolter]

If the question is from a textbook, you may find that they include one or more tables in the back of the book...

No it's a practice question that my teacher has set me. So I'm unsure if I have to look up a data table or not. I'll ask my teacher about it.

But there isn't enough information in the question to even work out thermal conductivity right?

 

[gneill]

But there isn't enough information in the question to even work out thermal conductivity right?

Correct.

 

[Bolter]

Correct.

Ok noted. I believe this was an old past exam question that my teacher gave. So quite possibly it should have come with a data sheet that I wasn't given here but was given in the exam.

 

[Chestermiller]

Why don't you just Google the thermal conductivity of copper. Is there a federal law against that?

 

[gmax137]

Or, express the answers in terms of the conductivity $k_{Cu}$, and then numerically, with a note
"based on $k_{Cu} = 4 \frac {watt} {cm-K}$ "