Question

(2)

(Total 6 marks)
6
Karen wants to pump up her car tyre.
Her pump has a piston with an area of 7 cm^2
175 N
area = 7 cm^2
Karen pushes the handle down with a force of 175 N.
(a)
What pressure does she exert on the air in the pump?

Answer 1

250000Pa

Step-by-step explanation:

Given parameters:

Force applied = 175N

Area = 7cm²

Unknown:

Pressure exerted by the air in the pump = ?

Solution:

Pressure is the force per unit area acting on a body;

Pressure =
`(force )/(area)`

Area = 7cm² ;

10000cm² = 1m²

7cm² is 7 x 10⁻⁴m²

Pressure =
`(175)/(0.0007)` = 250000Pa