Question

Calculate the pressure exerted by a brick, which applies a force of 30 N, when (a) It is placed upright on the soil. (b) When it is placed on its widest base. The length, breadth and height of the brick are 20cm, 10cm & 5 cm respectively

Answer 1

The pressure exerted by the brick when it is placed upright on the soil and on its widest base is 6000Pa and 1500Pa.

Given:

Force = 30N

The length, breadth, and height of the brick are 20cm, 10cm, and 5cm.

To Find:

The pressure is exerted by a brick when it is placed on its widest base and when it is placed on its widest base.

Solution:

Here, it is given that the force is $30N$.

now, when the brick is placed upright then,

(a). The area in contact with soil $=10cm\times 5cm$

here, we get

$\frac{10}{100}\times \frac{5}{100}$

$=\frac{50}{10000}$

$=0.005m^{2}$.

now,

$P=\frac{F}{A}$

here, substitute the given values in the above formula.

we get,

$P=\frac{30N}{0.005m^{2} } \\=6000Pa.$

(b). The area in contact with the soil $=20cm\times 10cm$

                                                              $=\frac{20}{100}\times \frac{10}{100} \\=\frac{200}{10000} \\=0.02m^{2}$

here, calculate the pressure exerted by the brick.

we know that, $P=\frac{F}{A}$

now, substitute the given values in the above formula.

we get,

$\frac{F}{A}=\frac{30N}{0.02}$

$=1500Pa.$

Hence, the pressure exerted by the brick when it is placed upright on the soil and on its widest base is 6000Pa and 1500Pa.

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Answer 2

Answer:

a) pressure when placed upright is 6000 Pa.
b) pressure when the base is width is 1500 Pa.

Explanation:

Pressure is defined as force per unit area and the formula of pressure is $\frac{F}{A}$, here F is the force applied and A is the area of the base.