Measurement of Young modulus of Copper

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Homework Help Overview

The discussion revolves around the measurement of Young's modulus of copper using experimental data collected from a copper wire. The original poster presents data on the mass applied and the corresponding extension of the wire, expressing uncertainty about how to analyze the data, particularly in determining the slope of the graph representing the relationship between mass and extension.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the challenges of determining the slope from experimental data and the difficulties in drawing a best-fit line due to the presence of multiple linear segments in the graph. Questions about the correctness of the graphing process are also raised.

Discussion Status

The conversation is ongoing, with participants providing insights into the nature of experimental data and the challenges of graphical representation. There is no explicit consensus on the best approach to analyze the data, but guidance on plotting and interpreting the graph has been offered.

Contextual Notes

Participants are navigating the complexities of experimental data analysis, including the implications of having multiple linear trends in the graph and the inherent uncertainties in such measurements.

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Homework Statement


my data as below
diameter of copper wire/m 0.025 (mean)
Unstretched part = 0.285m
mass(m)/KG extension(e)/m
0.1 0
0.2 0
0.3 0
0.4 0.001
0.5 0.001
0.6 0.001
0.7 0.003
0.8 0.003
0.9 0.005
1 0.005
1.1 0.006
1.2 0.009
1.3 0.014
1.4 0.021
1.5 break

Homework Equations



I don't know how to find the exact slope and the exact pattern of the graph
am my data wrong ?

The Attempt at a Solution

 
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What do you mean by "I don't know how to find the exact slope"? With experimental data, you can never get exact values. The best you can do is plot the data and draw a best-fit line.
 
ideasrule said:
What do you mean by "I don't know how to find the exact slope"? With experimental data, you can never get exact values. The best you can do is plot the data and draw a best-fit line.

i know but it is very difficult to draw a best fit line as the graph i draw showing two linear line
 
I see a nice-looking curve when I plot the data. Are you sure you graphed it correctly?
 

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