Question

Please answer questions (20)and (21)

Answer 1

20) The bodies are made in particular shape because ship is made in such a way that it can displace the same amount of waste as it weighs.
Aeroplane body is aerodynamic so that it can penetrate the air flow and can stay stable in mid air.

W = 300N

A = 100m^2

P = ?

P = F / A

Here pressure exerted by the body is equal to the force.

So, W = F

P = 300/100

P = 3 N/m^2

Thanks

Answer 2

20.

Sol..

Hey dude, let you get the answer...

(A) the aeroplane is designed like that because,when aeroplane moves forward, the air with some pressure and force will come opposite to the direction of the aeroplane....

So,to avoid the air and to move forward easily the aeroplane is designed like that....

(B)

It is useful for transporting or migrating the materials from one place to another...

(21)

WKT,

Pressure=force/area

GIVEN,

Force=300N

Area=100m²

We need to find the pressure...

Let we substitute this in the formula given above...

Pressure=300/100

Pressure=3N/m

Hope it will help you more...

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