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WAEC Physics 2020 Paper

Question : 35

Total: 51

Solution:

Concept:

In a hydraulic press, pressure is transmitted uniformly, so the force depends on the area of the cylinder.

Explanation:

The cross-sectional area of the cylinder is

A = \frac{\pi d^{2}}{4}

Since pressure

P

is constant, the force is

F = P \times A

Substituting for

A

, we get

F = P \times \frac{\pi d^{2}}{4}

Here,

P

and

\frac{\pi}{4}

are constants, so

F

varies only with

d^{2}

Hence,

F

is directly proportional to

d^{2}

Answer:

F \propto d^{2}

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