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Diameter of the football players' piston?

  1. Sep 25, 2009 #1
    1. The problem statement, all variables and given/known data
    A 54.0 kg cheerleader uses an oil-filled hydraulic lift to hold four 130 kg football players at a height of 1.40 m. If her piston is 18.0 cm in diameter, what is the diameter of the football players' piston?


    2. Relevant equations



    3. The attempt at a solution

    54 /18^2 = 520/x^2
    x= 55.85696 cm

    What am i doing wrong?
     
  2. jcsd
  3. Sep 25, 2009 #2

    Delphi51

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    Homework Helper

    Run that through your calculator again; looks like a calculation error.
    Might be worth writing out the cross multiplication step.
     
  4. Sep 25, 2009 #3
    it's not... I still get the same answer running it through my calculator
     
  5. Sep 25, 2009 #4

    Borek

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    Staff: Mentor

    Why do you think it is wrong?

    Sig figs perhaps?

    Edit: I must admit thread subject made me wonder if it is not XXX site link spam...
     
    Last edited: Sep 25, 2009
  6. Sep 25, 2009 #5

    Delphi51

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    Homework Helper

    Sorry, I made the mistake! Checked it again and got your answer.
     
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