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The velocity of efflux of the liquid is given as
v=2gy
The impact force of the emerging liquid on the vessel + liquid content is equal to
F=vdmdt=vaρv=aρv2
(since av = volume per sec & avρ = mass per sec )
F=aρ(2gy)=2aρgy
The force of friction = f = F = 2aρgy
μN = 2aρgy
μ(Aρgy) = 2a ρgy
μ = 2a/A
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