Question

A bent tube is lowered into water stream as shown in the Fig. The velocity of the stream relative to the tube is equal to $v=2m/s$. The closed upper end of the tube located at height $h_0=10cm$ above free surface of water has a small orifice. To what height h will the water get spurt?

• A. 40 cm
• B. 20 cm
• C. 10 cm
• D. 5 cm

Answer 1

The correct option is C

10 cm

Applying Bernoulli's theorem for points 1 and 2 of the streamline shown

$P_0\to$ Atmospheric pressure

$\frac{1}{2}\rho V^2+(P_0+\rho g{h}^{\prime })+0=0+P_0+\rho g(h^{\prime }+h_0+h)$

$\Rightarrow h=10cm$