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  4. The velocity of efflux of a liquid through an orifice in the bottom of the tank does not depend upon

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Q. The velocity of efflux of a liquid through an orifice in the bottom of the tank does not depend upon

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Solution:

$P _{0}+\frac{1}{2} \rho_{\text {bottom }} v ^{2}= P _{0}+\rho_{\text {liquid }} gh$
Velocity of efflux is independent of the size of orifice.
The density of the fluid is actually varying with depth for large heights. In such scenarios, velocity of efflux depends on the density of the liquid.

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