Bernoulli's principle- fluids ?

[A_Munk3y]

bernoulli's principle- fluids...?

Homework Statement

http://img30.imageshack.us/img30/4119/45086777.jpg

Homework Equations

A1V1=A2V2
P2+1/2pv1^2 = p1+1/2pv2^2
P+1/2mv^2 + pgy = constant

The Attempt at a Solution

V2=A1*V1/A2
1/2*p*A1^2*V1^2*p*g*h/A2^2=1/2pv1^2
2*g*h*A1^2V1^2/ A2^2=V1^2
V1=A1*V1gh/A2and I am stuck... i end up canceling the V1 >:(

 

[A_Munk3y]

GOOOOD!
i've tried like 10 different things and i can't get it..

 

[ehild]

Do you think this equation correct? "P2+1/2pv1^2 = p1+1/2pv2^2"

ehild

 

[minger]

Write out your full Bernoulli's equation:
$$P + \frac{\rho V^2}{2} + \rho g z = c$$
The pressure values are both places are ambient so they cancel. You have the change in distance z2 - z1, so the only thing left is to find the velocity. Unfortunately, you don't have this.

So, it will be useful to write our your velocity term as a function of mass flow and area. You know that mass flow is equal, so you will eventually be left with simply area.

 

[A_Munk3y]

i got it!
thanks ! :D