Answer: D: Vact ÷ Vth
The velocity coefficient at the vena contracta is Vact ÷ Vth.
The Coefficient of Velocity is defined as the ratio between the actual velocity of a jet at vena-contracta and the theoretical velocity of a jet.
Cv = Vact ÷ Vth
The range of Cv varies from 0.95 to 0.99.
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