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?
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!