What is the Young's Modulus of Copper?

[groom03]

Homework Statement

I'm supposed to calculate the youngs modulus of a 2 meter length of copper wire.

Homework Equations

None

The Attempt at a Solution

for 30SWG i get 26GPa
for 38 i get 3.1 GPa
and for 24 i get 49 GPa

Youngs modulus of copper is meant to be ~100GPa (from wiki)

Have i forgotten to do something or are my results way off?

 

[Dick]

You aren't 'calculating young's modulus'. You looked that up. You are calculating something else. What is it? What formula are you using to obtain it? The units of what you are after probably aren't GPa.

 

[groom03]

I made a force extension graph and the gradient is k i use that in the formula E=kL/A
where L is the original length and A is the cross sectional area of the wire.

 

[Dick]

Ok, so k=EA/L. The units of E are N/m^2, A is m^2 and L is m. So the units of k are N/m. If that's the units for your answers they don't look right. Pick 24SWG for example. What's the wire diameter? What do you get for the area?

 

[groom03]

Sorry sorry sorry sorry sorry to waste peoples time, me and my teacher had a look at it today and ,my answer is right but there is a huge error because of the rubbishy equipment i was stuck using