Q. If the velocity head of a stream of water is equal to 10 cm, then its speed of flow is ($g = 10\ ms^{- 2}$)
A) $10\ ms^{- 1}$
B) $140\ ms^{- 1}$
C) $1.4\ ms^{- 1}$
D) $0.1\ ms^{- 1}$
Explanation
(c) Velocity head, $h = \frac{1}{2}\frac{v^{2}}{g}$ or $v = \sqrt{2gh}$
$= \sqrt{2 \times 10 \times 0.1} = 1.4\ ms^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.