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Hydralic lift

  1. Jan 15, 2008 #1
    1. The problem statement, all variables and given/known data

    A hydraulic lift has two connected pistons with cross-sectional areas 5 cm^2 and 550 cm^2. It is filled with oil of density 520 kg/m3.


    a) What mass must be placed on the small piston to support a car of mass 1500 kg at equal fluid levels?



    2. Relevant equations
    Is the oil density a red herring in this question???


    3. The attempt at a solution

    F = mg (A1/A2)

    F = mg (5cm/550cm)^2

    F = (1500kg)(9.81)(5cm/550cm)^2

    F = 1.261N = wrong!

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



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 15, 2008 #2

    mgb_phys

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    Homework Helper

    A hydraulic system is just ratios.
    In this case just the ratio of the two areas
     
  4. Jan 15, 2008 #3

    Shooting Star

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    Homework Helper

    > F = (1500kg)(9.81)(5cm/550cm)^2


    ??
    Re-think...
     
  5. Jan 15, 2008 #4
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