# A circular piston exerts a pressure of 80 k Pa on a fluid, when the force applied to the piston is 0.2kN. What is the diameter of the piston ?

##### 2 Answers

#### Explanation:

A =

A =

r =

r = 0.028

D = 2r = 0.056 m

The diameter is 0.056 m.

#### Explanation:

Pressure is force divided by area.

Therefore, by the manipulations of algebra, area = force/pressure.

So the area of the piston is given by

To find diameter we first need to get the radius using the formula for the area of a circle.

area =

So the diameter is 0.056 m.

Or 5.6 cm if you prefer.

I hope this helps,

Steve