Question

At what speed will the velocity head of stream will become 40cm?

Answer 1

I think your actual question is: At what speed will the velocity head of a stream of water be equal to 40 cm of mercury

Solution: head of mercury(Hg) coumn,h = 40cm = 0.4m
Velocity head = 40cm of Hg column hw = h ∙ 13.6 cm of water column. (You must know this relation)
hw = v^2 /2g
v^2 = 2ghw
v = √(2ghw)
=√(2 ∙ 9.8 m s ∙ 0.4m ∙ 13.6)
= 10.3 m s

Answer: velocity head of wateer is 10.3m/s

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