Bernoulli's Principle with a Venturi Tube, find flow rate

[heatherro92]

So that's the question and I'm stuck on Part b. I don't even know how to approach it. I know A1= 3A2 but I don't know A1 and I need V2 and I don't know V1 or A2. I'm just confused as to how to do this. Please help!

 

[haruspex]

Are you aware of Bernoulli's equation? You mention Bernoulli in the title but don't quote the equation.

 

[heatherro92]

I understand the equation ρgy1+ (1/2)v1^2 + P1 =ρgy2+ (1/2)v2^2 + P2 but I do not understand how to apply it to this

 

[rcgldr]

I understand the equation ρgy1+ (1/2)v1^2 + P1 =ρgy2+ (1/2)v2^2 + P2 but I do not understand how to apply it to this

You need one more equation, based on the fact that mass flow within all parts of the venturi tube is constant.