First slide

Fluid statics

Question

Radius of one arm of hydraulic lift is four times of radius of other arm. What force should be applied on the narrow arm to lift 100 kg?

Moderate

A

26.5 N
B

62.5 N
C

6.25 N
D

8.3 N

Solution

By Pascal's law $\frac{F}{A} = \frac{f}{a} \Rightarrow f = \frac{Fa}{A} = \frac{100 g \times {πr}^{2}}{π {(4 r)}^{2}} = 62.5 N$

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