Question

What is the amount of force required to produce 150Pa pressure on

20m2

area? If the area became doubled by keeping force constant, then

what will be the change in pressure?​

Answer 1

Answer:-

In case 1st

Pressure ,P = 150 Pa

Area ,A = 20m²

As we know that Pressure is calculated by the Force acting per unit area.

• P = F/A

where,

• P denote pressure
• F denote Force
• A denote area

Substitute the value we get

$:\implies$ 150 = F/20

$:\implies$ F = 150×20

$:\implies$ F = 3000 N

so , force acting in 1st case is 3000 N

In case 2nd it is given that the area became doubled .

So new area will be

New Area ,A' = 20×2 = 40m²

And Force acting on it is constant .

So , the pressure exerted in this case

• P' = F/A'

Substitute the value we get

$:\implies$ P' = 3000/40

$:\implies$ P' = 300/4

$:\implies$ P' = 75 Pa

So, the change in pressure = 150-75 = 75 Pa

• Hence, the change in pressure is 75 Pascal.

Answer 2

Answer:

F = PA

F = 150 × 20

F = 3000 N

Area doubled = 40 m²

P = 3000/40

P = 75 Pa

Explanation: