A .......... m/s speed velocity head of water is equal to pressure head of 40, cm of Hg .

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9-1.Fluid Mechanics

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A .......... $m/s$ speed the velocity head of water is equal to pressure head of $40\, cm$ of $Hg$ .

A

$10.3$

B

$2.8$

C

$5.6$

D

$8.4$

Solution

$\mathrm{h}=40 \mathrm{cm}$ of $\mathrm{Hg}=40 \times 13.6 \mathrm{cm}$ of water

$=\frac{40 \times 13.6}{100} \mathrm{m}$ of water $=4 \times 1.36 \mathrm{m}$ of water

$\mathrm{V}^{2}=2 \mathrm{gh}$

$\Rightarrow V=\sqrt{2 g h}=\sqrt{2 \times 9.8 \times 4 \times 1.36}$

$=\sqrt{106.624}=10.32 \mathrm{m}$

Standard 11

Physics

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