Question

A house brick of dimensions 21.0cm × 10.0cm ×7.00cm

The brick is held underwater with its largest surfaces horizontal.The density of water is 1000kg/m³

(a) calculate the difference in pressure between the top and the bottom surfaces of the brick

Answer 1

Answer:

700 Pa

Explanation:

Brick is held under water, so assume depth for bottom surface as height of the brick, therefore, on the top surface, there is only Atmospheric pressure, which is the same for the bottom surface.

Therefore, we only have calculate the pressure of the bottom surface, make sure the unit must be the same (i.e. depth to be converted to meter to be in sync with density metric) -

Pressure = depth x desity x gravity

Pressure = (7/100) x 1000 x 10

               = 70000/100

               = 700 Pa