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KEAM 2016 Physics and Chemistry Paper
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© examsnet.com
Question : 12
Total: 120
In a horizontal pipe of non-uniform cross-section, water flows with a velocity of
1
m
s
−
1
at a point where the diameter of the pipe is
20
c
m
. The velocity of water (in
m
s
−
1
) at a point where the diameter of the pipe is 5
c
m
is
64
24
8
32
16
Validate
Solution:
Diameter of pipe at first point
(
d
1
)
=
20
c
m
=
0.2
m
.
Radius of prpe at first point
(
r
1
)
=
0.2
2
=
0.1
m
Velocity of water at first point
(
v
1
)
=
1
m
s
−
1
Diameter af pipe at second point
(
d
2
)
=
5
c
m
=
0.05
m
Radiusof pipe at second point,
(
r
2
)
=
0.05
2
=
0.025
m
According to equation of continuity.
A
1
v
1
=
A
2
v
2
π
t
1
2
v
1
=
π
2
2
v
2
v
2
=
(
r
1
r
2
)
2
×
v
1
v
2
=
(
0.1
0.025
)
2
×
1
v
2
=
16
m
s
−
1
© examsnet.com
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