Water flows in a horizontal tube as shown in figure.The pressure of water changes by 600N/m2 between A and B where the areas of cross section are 30cm2 and 15cm2 respectively.Find the rate of flow of water through the tube
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Explanation:
Correct option is
A
189cm
3
/s
Let the velocity at x = v
x
and that at y = v
y
.
By the equation of continuity,
v
x
v
y
=
1.5cm
2
3cm
2
=2
By Bernoulli's equation,
P
x
+
2
1
pv
x
2
=P
y
+
2
1
pv
y
2
or,P
x
−O
y
=
2
1
p(2v
y
)
2
−
2
1
pv
y
2
=
2
3
pv
y
2
or, 600
m
2
N
=
2
3
(1000
m
3
kg
)v
x
2
or, v
x
=
0.4m
2
/s
2
=0.63m/s
The rate of flow =(3cm
2
)(0.63m/s)=189cm
3
/s.
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