Question

A cubical block of weight W having volume 1000 cube centimetre is placed on the surface of a horizontal table. if it exerts a pressure of 200 Pascal on the table top, then the value of W is (1) 20N (2) 2N (3) 200N (4) 0.2N

Answer 1

pressure depends on area of contact which should be given.

Answer 2

The weight of the block is 12 N.

Explanation:

It is given that,

Volume of a cubical box, V = 1000 cm³

If exerts a pressure of 200 Pa on the table top.

We need to find the value of weight of the box. Pressure exerted by an object is given by force acting on it per unit its area. It can be given by :

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

If a is the side of cubical block, its volume is given by :

$a^3=1000\\\\a=10\ cm=0.1\ m$

Area of cubical block is, $A=6a^2=6(0.1)^2=0.06\ m^2$

Now,

Weight of the block,

$F=W=PA\\\\W=200\times 0.06\\\\W=12\ N$

So, the weight of the block is 12 N.

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Pressure

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