First slide

Fluid dynamics

Question

A cylindrical tank has a hole of 1 cm² in its bottom. If the water is allowed to flow into the tank from a tube above it at the rate of 70 cm³/sec. then the maximum height up to which water can rise in the tank is

Moderate

A

2.5 cm
B

5 cm
C

10 cm
D

0.25 cm

Solution

The height of water in the tank becomes maximum when the volume of water flowing into the tank per second becomes equal to the volume flowing out per second.
Volume of water flowing out per second
= Av $= A \sqrt{2 gh}$ …(i)
Volume of water flowing in per second
$= 70 {cm}^{3} / sec$ …(ii)
From (i) and (ii) we get
$\begin{array}{l} A \sqrt{2 gh} = 70 \Rightarrow 1 \times \sqrt{2 gh} = 70 \\ \Rightarrow 1 \times \sqrt{2 \times 980 \times h} = 70 \\ ∴ h = \frac{4900}{1960} = 2 .5 cm \end{array}$

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