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Homework Help: Finding the density

  1. Feb 3, 2008 #1
    Hi everyone,

    1. The problem statement, all variables and given/known data

    A standard 1kg weight is a cylinder 50.0 mm in height and 51.5 mm in diameter. What is the density?

    2. Relevant equations

    volume of a cylinder=hr^2

    3. The attempt at a solution

    =3.32 x 10^4 mm^3

    density=1kg/3.32 X 10^4mm^3

    Could someone please tell me if this is correct?

    Thank you very much
  2. jcsd
  3. Feb 3, 2008 #2
    You are off by a factor of pi.
  4. Feb 3, 2008 #3
    Thank you very much

    What is pi?
  5. Feb 3, 2008 #4
    The volume of a cylinder is the area of a circle times the height of the cylinder.

    You seem to be asking a lot of questions here lately...
  6. Feb 3, 2008 #5
    Thank you very much

  7. Feb 3, 2008 #6
    Uhhh... joke?

    It's the ratio of the circumference of a circle to its diameter. pi = C/d ~ 3.141592...
  8. Feb 3, 2008 #7
    Thank you very much
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