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sghaussi

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**The piston of a hydraulic automobile lift is X meters in diameter.**

What gauge pressure, in pascals, is required to lift a car with a mass of Y kg?

What gauge pressure, in pascals, is required to lift a car with a mass of Y kg?

I know that a piston is a cylindrical shaped apparatus - however I believe that does not affect my calculations.

I also know this about pressure: p = F/A

F = mass x a so in my case that would be: Y kg x 9.8m/s

A (of a circle) = 2 x pi x r^2 r being half my diameter so X/2

From using this formula, the pressure is calculated in Pascals. The answer I get however is wrong. Am i using the wrong formula? should find the volume of the piston? I'm not sure how that would help... hope someone can give me some hints! =)