First slide

Fluid statics

Question

In a hydraulic lift at a service station, the radii of the large and small piston are in the ratio of 20 : 1. What weight placed on the small piston will be sufficient to lift a car of mass 1200 kg?

Easy

A

3 kgf
B

30 kgf
C

300 kgf
D

3000 kgf

Solution

Equating pressure,
$\frac{F}{{πR}^{2}} = \frac{1200}{π {[20 R]}^{2}} or F = 3 kgf$

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