Q.

At what speed, the velocity head of water is equal to pressure head of 40 cm of Hg?

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a

10.3 m/s

b

2.8 m/s

c

5.6 m/s

d

8.4 m/s

answer is A.

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Detailed Solution

P=ρu22    P= ρgh u=2Pρw=2×400×105760×103=10.3 m/s.
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At what speed, the velocity head of water is equal to pressure head of 40 cm of Hg?