Question

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

• A. 10.32 m/s
• B. 10.23 m/s
• C. 10.52 m/s
• D. 10.54 m/s

Answer 1

Answer: (A)

10.32 m/s

$Velocityhead=\frac{1}{2}\rho v^2$

$p=\rho gh$

h =40 cm of hg

and $g={10}^{3}cm/s^2$

$\frac{1}{2}\rho v^2=\rho gh$

v=sqrt(2gh)

=282.8 cm/sec =10.32 m/s