First slide

Fluid dynamics

Question

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

Moderate

A

Zero
B

20.8 cm
C

10.6 cm
D

40.0 cm

Solution

According to Bernoulli's theorem, $h = \frac{v^{2}}{2 g}$
$\Rightarrow h = \frac{{(2 .45)}^{2}}{2 \times 10} = 0 .314 = 31 .4 cm$
$∴$ Height of jet coming from orifice
$= 31 .4 - 10 .6 = 20 .8 cm$

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