What is the Young's Modulus of Copper?

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    Copper Modulus
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Homework Help Overview

The discussion revolves around calculating the Young's modulus of a copper wire, specifically focusing on different wire gauges and the corresponding modulus values obtained by the original poster.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate Young's modulus using values derived from a force-extension graph and a formula involving the gradient. Some participants question the validity of the calculations and the units used, prompting a reevaluation of the approach.

Discussion Status

Participants are actively engaging in clarifying the calculations and questioning the assumptions made regarding the measurements and equipment used. There is a recognition of potential errors in the original poster's approach, but no consensus has been reached on the correct method or values.

Contextual Notes

The original poster mentions using inadequate equipment, which may have influenced the results. There is also a reference to a comparison with a commonly accepted value for Young's modulus of copper.

groom03
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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?
 
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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.
 
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.
 
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?
 
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
 

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