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  4. 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

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Q. 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

Mechanical Properties of Fluids

Solution:

According to Torricelli's theorem, the velocity of efflux of water,
$v=\sqrt{2 g h}=\sqrt{2 \times 10 \times 20}=20\, ms ^{-1}$.