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Pascal's Principle Problem

  1. Nov 13, 2007 #1
    A piston of cross-sectional area "a" is used in a hydraulic press to exert a small force of magnitude "f" on the enclosed liquid. A connecting pipe leads to a larger piston of cross-sectional area A. (a) what force magnitude F will the larger piston sustain without moving? (b) If the piston diameters are 3.80 cm and 53.0 cm, what force magnitude on the small piston will balance a 20.0 kN force on the large piston?

    A picture of the figure can be found at

    I used the formula f/a = F/A for (a). the answer I found was F = f x 195. Am i supposed to leave f in my answer. If no, how do i solve for f.

    I used the same formula for (b) and got 102.

    Please help me double check my answers.
  2. jcsd
  3. Nov 14, 2007 #2

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    Seems to be correct. In the first Q, you just have to write fA/a, I think, because the values are given only in (b).
  4. Nov 14, 2007 #3
    Thanks for the help.
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