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Young's modulus

  1. Sep 20, 2015 #1
    1. The problem statement, all variables and given/known data
    The figure shows the stress-strain curve for a material. The scale of the stress axis is set by s = 280, in units of 10^6 N/m2. What are (a) the Young's modulus and (b) the approximate yield strength for this material?

    2. Relevant equations
    E=stress/strain

    3. The attempt at a solution
    so i know that for part a i needa divide 280/.004 but im not sure what it means to use units of 10^6. also shouldnt part b be 280? the unit that is correct is N/m^2 (its an online grading program that told me this is correct) and i cannot answer a 10^6 or any 10^.... (the system wont read it) what am i not understanding?
     

    Attached Files:

  2. jcsd
  3. Sep 20, 2015 #2

    billy_joule

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    It means that if you enter [answer] this will be interpreted as [answer] x 106 N/m2
    e.g. if you put in 6 your answer will be interpreted as 6 Mega Pascals
     
  4. Sep 20, 2015 #3
    so shouldnt the answer to part a be .07 n/m^2?
     
  5. Sep 20, 2015 #4

    billy_joule

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    What are the units of the '280' ?

    What does 280 / 0.004 equal? What are it's units?
     
  6. Sep 20, 2015 #5
    280*10^6
    so then the answer would be 7e10 but rly 7e4 bc of how the the program will interpret it?
     
  7. Sep 20, 2015 #6

    billy_joule

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    You still didn't provide any units but yes you are on the right track.

    280 MPa / 0.004 = 70 GPa = 70 000 MPa = 70 000 x 106 N / m2
     
  8. Sep 21, 2015 #7
    so my final answer would be 70000e6 N/m^2 for part a and 250e6 N/m^2 for part b?
     
  9. Sep 21, 2015 #8

    billy_joule

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