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Q.

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?

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a

3000 kgwt

b

30 kgwt

c

300 kgwt

d

3 kgwt

answer is A.

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Detailed Solution

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Equating pressure,

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

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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?