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Q.

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

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a

8.4 m/s

b

5.6 m/s

c

10.3 m/s

d

2.8 m/s

answer is A.

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Detailed Solution

Pressure head = 40 x 13.6 cm of water

$Velocity head = \frac{v^{2}}{2 g}$

$\Rightarrow 40 \times 13 .6 = \frac{v^{2}}{2 \times 1000}$

$\Rightarrow v = 1030 {cms}^{- 1} = 10 .3 {ms}^{- 1}$

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