Question

The pressure exerted by the weight of a Cubical block of side 4 cm on the surface is 10
pascal. Calculate the weight of the block.
Explain the principle on which the working of a
hydrometer is based.
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Answer 1

Hello mate your answer is in this photo

Archimedes' principle on which the working of a hydrometer is based.

Hope it helps.

Answer 2

Given :

Side of cubical block , a = 4 cm = 0.04 m .

Pressure exerted by the side on surface , P = 10 Pa .

To find :

The weight of the block .

Solution :

We know , pressure is given by :

$P=\dfrac{W}{A}$                              

Here , W is weight and A is area of surface .

Therefore , $W=P\times A$         ....... ( 1 )

Now , Area of square is given by :

$A=a^2\\A=0.04^2\ m^2\\A=1.6\times 10^{-3}\ m^2$

Putting value of A and P in equation 1 .

We get :

$W=10 \times 1.6\times 10^{-3} \ N\\W=0.016 \ N$

Therefore , the weight of the block is 0.016 N .

Learn More :

Force and Pressure

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