ULTIPLE CHOICE QUESTIONS (MCO) :
[1 mark each)
e
) at a depth
inside a liquid of density
is
(d) phdg
en barometrie herght indicates-
(b) Extremely dry weather
(d) Possibility of rain
pinis tingia
Sipos
Fortis's barometer 1 Artesian well (d) Atomiser
w of a body and buoyant force exerted by the liquid on it, then the body sinks
Answers
Explanation:
Let us consider a container which contains a liquid of density d.
consider a cylindrical column of height h from the surface of liquid of cross section area A.
the volume of liquid column
V=Ax h
mass = density x volume
m= Axhxd
weight w= mxg
w=mg
= Axhxdxg
there are three forces acting on water column.
1. weight, vertically down.
2. force on top surface due to atmospheric pressure ( P°A), acting vertically Down.
3. Force on bottom surface if column due to static pressure of liquid ( PA), acting vertically up
from Newton's law
PA= P° A +w
PA = P° A + hdgA
P= P° + hdg
note : P° read it as p not.
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OR
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Pressure = Force/ Area
Force in a fluid = Thrust= weight of the liquid = (volume of liquid × density × Acceleration due to gravity.)
volume= v (Area,A × height,h)
density= d
gravitational pull= a
Thrust = A × h × d × a
Pressure= Thrust / area
=A × h × d × a
A
Therefore the pressure = h × d × a (height of the column of the liquid ×density of the liquid × acceleration due to gravity)
Pressure in liquid = h×d×a
However when the liquid is exposed to the atmosphere, you have to factor in the pressure due to the column of the air.
Pressure in liquid = atmospheric pressure + (h×d×a)
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