12
1 2 1 2 p1 + ρ v1 = p2 + ρ v2 2 2 1 1 2 2 p1 − p2 = ρ ( v2 − v1 ) = ρ ( v 2 − V 2 ) 2 2
vV AV = av
A v= V a 21 2 1 A 2 p1 − p2 = ρV 2 − 1÷ 2 a
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