First slide

Fluid dynamics

Question

At what speed the velocity head of a stream of water be equal to 40 cm of Hg

Moderate

A

282.8 cm/sec
B

432.6 cm/sec
C

632.6 cm/sec
D

832.6 cm/sec

Solution

$\begin{array}{l} \frac{v^{2}}{2 g} = h \Rightarrow v = \sqrt{2 gh} \\ = \sqrt{2 \times 10^{3} \times 40} = 2 \sqrt{2} \times 10^{2} = 282 .8 cm / s \end{array}$

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