Q. An L-shaped tube with a small orifice is held in a water stream as shown in fig. The upper end of the tube is $10.6\ cm$ above the surface of water. What will be the height of the jet of water coming from the orifice? Velocity of water stream is $2.45\ m/s$
A) Zero
B) $20.0\ cm$
C) $10.6\ cm$
D) $40.0\ cm$
Explanation
(b) According to Bernoulli’s theorem, $h = \frac{v^{2}}{2g}$
$\Rightarrow h = \frac{(2.45)^{2}}{2 \times 10} = 0.30m = 30.0cm$
$\therefore$ Height of jet coming from orifice
$= 30.0 - 10.6 = 19.4cm \cong 20cm$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.