Hydralic lift

  • Thread starter mujadeo
  • Start date
  • #1
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Homework Statement



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?



Homework Equations


Is the oil density a red herring in this question???


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!

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
7,819
14
A hydraulic system is just ratios.
In this case just the ratio of the two areas
 
  • #3
Shooting Star
Homework Helper
1,977
4
> F = (1500kg)(9.81)(5cm/550cm)^2


??
Re-think...
 

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