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Young's modulus problem

  1. Jul 22, 2008 #1
    hi

    i have been given these results in order to work out the young's modulus can any 1 tell me how i go about doin this

    Force (kN) Extension (mm)
    0.5 0.003
    1 0.011
    1.5 0.019
    2 0.021
    2.5 0.024
    3 0.032
    3.5 0.040
    4 0.043
    4.5 0.050
    5 0.060
    5.5 0.064
    6 0.070
    6.5 0.076
    7 0.081

    Area 50mm by 5

    thanks for all your help
     
  2. jcsd
  3. Jul 22, 2008 #2

    rock.freak667

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    Homework Helper

    [tex]E=\frac{stress}{strain}[/tex]


    Write the formula for stress and the formula fopr strain and then simply the formula for Young's Modulus,E.
     
  4. Jul 26, 2008 #3
    i know the equation but i didnt know which part of the data to use, do i just take any part of the data from the table or do i have to plot a graph! thanks for all ya help!
     
  5. Jul 27, 2008 #4
    what is meant by "area 50mm by 5 " in your data ? please explain.
     
  6. Jul 28, 2008 #5

    rock.freak667

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    Homework Helper

    [tex]E=\frac{\frac{F}{A}}{\frac{e}{l}}[/tex]


    [tex]E=\frac{Fl}{Ae}[/tex]

    Right?


    From your graph, what does the fraction F/e represent?
     
  7. Jul 29, 2008 #6
    50mm length, 5mm diameter
     
  8. Jul 29, 2008 #7
    got the answer to be 5.3 is that correct!

    equation used

    2.5 x 50
    ----------
    981.75 x 0.024
     
  9. Aug 3, 2008 #8
    any takers! thanks
     
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