A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in ms⁻¹) through a small hole on the side wall of the cylinder near its bottom is (a) 10 (b) 20 (c) 25.5 (d) 5

Answer: (b). Torricelli: v = √(2gh) = √(2(9.8)(20)) = √(392) ≈ 19.8 ≈ 20 m/s So the answer is (b) 20.

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Velocity of Efflux (Torricelli)

A cylinder of height $20\text{ m}$ is completely filled with water. The velocity of efflux of water (in $\text{ms}^{-1}$ ) through a small hole on the side wall of the cylinder near its bottom is

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Answer: (b)

Torricelli: $v = \sqrt{2gh} = \sqrt{2(9.8)(20)} = \sqrt{392} \approx 19.8 \approx 20\text{ m/s}$
So the answer is (b) 20.

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