Question

Calculate the pressure exerted by a brick, which applies a force of 2.5 N, when(a) It is placed upright on the soil (b) When it is placed on its widest baseThe length, breadth and height of the brick are 25cm, 10cm & 5 cm respectively

Answer 1

since pressure=Force/Area
when it is placed upright its length and breadth will be 10 & 5 respectively
so area=10*5=50cm2=
0.005m2
Pressure=2.5N/0.005m2
=500N m-2
in case b it is placed on widest base i.e. 25cm
so area =25*10=2500cm2
=0.25m2
Pressure=2.5/0.25=10N m-2

Answer 2

Given:

Force = 2.5N

Length = 25cm

Breadth = 10cm

Height = 5cm

To find:

(a) Pressure when it is placed upright on the soil.

(b) Pressure when it is placed on its widest base.

Solution:

a) Pressure=Force/Area

 Area = 10*5 = 50cm²

                     = 0.005m²

Pressure = 2.5N/0.005m²

               = 500 N/m²

Hence,  the pressure when it is placed upright on the soil is 500N/m².

b) Pressure=Force/Area

     Area = 25*10 = 2500cm²

                            =0.25m2

Pressure = 2.5/0.25

               = 10 N/m²

Hence,  the pressure when it is placed on its widest base is 10 N/m².