Water flows into a horizontal pipe whose one end is closed with a valve and the reading of a pressure gauge attached to the pipe is 3 × 10⁵ N/m². This reading of the pressure gauge falls to 1 × 10⁵ N/m² when the valve is opened. Calculate the speed of water flowing into the pipe.
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Answer:Applying Bernoulli's principle when the pipe was closed and after it was opened,
⇒P
1
=P
2
+
2
1
ρV
2
⇒3.5×10
5
=3×10
5
+
2
1
ρV
2
⇒
10
3
0.5×10
5
×2
=V
2
⇒10
2
=V
2
⇒V=10m/s
Explanation:
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