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Measurement of Young modulus of Copper

  1. Dec 4, 2009 #1
    1. The problem statement, all variables and given/known data
    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

    2. Relevant equations

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

    3. The attempt at a solution
     
  2. jcsd
  3. Dec 5, 2009 #2

    ideasrule

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    Homework Helper

    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.
     
  4. Dec 5, 2009 #3
    i know but it is very difficult to draw a best fit line as the graph i draw showing two linear line
     
  5. Dec 5, 2009 #4

    ideasrule

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    Homework Helper

    I see a nice-looking curve when I plot the data. Are you sure you graphed it correctly?
     
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