Pascal's Principle Problem

  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. Shooting Star

    Shooting Star 1,979
    Homework Helper

    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. Thanks for the help.
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