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Q.

In a hydraulic lift, used at a service station the radius 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 1500 kg?

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a

7.5 kg

b

37.5 kg

c

75 kg

d

3.75 kg

answer is A.

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Detailed Solution

F1A1=F2A2

∴F1=A1A2⋅F2=1202(1500)=3.75kg

A=πr2 

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