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Homework Help: Method for unit conversion?

  1. Jul 5, 2014 #1
    I need to convert 12.5 MPa·mm1/2 into MPa.m1/2.

    I am unsure on how to do this, my two guesses are as follows:

    1. (12.5) / ( 1 / 10001/2) = 395.28 MPa.m1/2

    2. (12.5) / (12.5 / 10001/2) = 31.62 MPa.m1/2


    Is either of those correct? Thanks!
     
  2. jcsd
  3. Jul 5, 2014 #2
    Dear Dave,
    is the 1/2 exponent correct? Isn't it -2?
    Best regards!
     
  4. Jul 5, 2014 #3
    I've just doubled checked and the 1/2 exponent is correct, the value is a material constant. Is it possible to convert it into MPa.m1/2? Thanks.
     
  5. Jul 5, 2014 #4

    Nathanael

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    Homework Helper

    It should be possible.

    (MPa = "MegaPascal"?)
    (mm = "millimeter"?)

    (If those [itex]\uparrow[/itex] are the units then) Your original two answers shouldn't be right, because you would expect the answer to be significantly smaller, right?


    (Converting mm to m would decrease the numerical value)
     
  6. Jul 5, 2014 #5
    Ahh I see, so should I be calculating (12.5 / 10001/2) = 0.395 MPa.m1/2?

    Thanks!
     
  7. Jul 5, 2014 #6

    Nathanael

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    Homework Helper

    Yeah

    The meticulous method of figuring it out would be:
    [itex]12.5 MPa(mm)^{1/2}=12.5MPa(\frac{m}{1000})^{1/2}=\frac{12.5MPa\cdot m^{1/2}}{1000^{1/2}}=0.395MPa\cdot m^{1/2}[/itex]
     
  8. Jul 6, 2014 #7
    Dear Dave,
    this is new to me! What is this unit used for?

    Best regards!
     
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