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Homework Help: Hydraulics and pressure problem

  1. Sep 25, 2014 #1
    1. The problem statement, all variables and given/known data
    The hydraulic system is this: It has two stamps (Unsure of how I am to translate that word). Basically it is the plate on which we apply pressure. You apply pressure on one of them, the other goes up. The question is:
    How high will the big stamp move upwards when the small one is pressed down with a force F to 6 .0 cm?

    Area of the small one = 2.0 cm^2
    Radius of the small one = 6 cm

    F = 250N

    3. The attempt at a solution
    The proposed solutions is just answering with this: a (area of the small one) * h (6.0 cm) = AH

    ah = AH => H = (ah)/A

    I don't understand why?

    Thank you in advance.
  2. jcsd
  3. Sep 25, 2014 #2


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    I think for "stamp", the word you are looking for is "piston".
  4. Sep 25, 2014 #3
    Yep, that's it.
  5. Sep 25, 2014 #4


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    Think about volumes. When one piston is pushed down into the fluid, what volume is displaced? How does that relate to what the other piston does?
  6. Sep 30, 2014 #5
    I assume you meant to say that the radius of the LARGE piston is 6 cm (not the small one).
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