4) The speed of water is 2m/s through a pipe of internal diameter 10 cm. what should be the intermal diameter of nozzle of the pipe if if speed of water nozzle is 4m/s.
Correct answer 30 points .
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Answer:
Answer
Data: d
1
=10cm=0.1m,v
1
=2m/s,v
2
=4m/s
By the equation of continuity, the ratio of the speed is
v
2
v
1
=
A
1
A
2
=(
d
1
d
2
)
2
∴
d
1
d
2
=
v
2
v
1
=
4
2
=
2
1
=0.707
∴d
2
=0.707d
1
=0.707(0.1m)=0.0707m
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