Question

How much thrust (in $\text{N}$) will be required to exert a pressure of $20,000\text{Pa}$ on an area of $15{\text{cm}}^2$?

• A. 30

Answer 1

The correct option is A 30
From definition of pressure,

Pressure $=\frac{\text{Thrust}}{\text{Area of contact}}$

Given: Pressure = $20,000\text{Pa}$.
and Area of contact = $15{\text{cm}}^2$

Thrust $=20000\text{Pa}\times 15{\text{cm}}^2$

$=20000\text{Pa}\times 15\times {10}^{-4}{\text{m}}^2$

$=30\text{N}$