# Fluid Mechanics - Linear Momentum

1. Sep 8, 2009

### EmmaJ

I know the equation for conservation of linear momentum, and Bernoulli's equation:

So I've tried using Bernoulli's equation to find V1, then use the continuity principle to find V2, but then I get stuck on the mass flow rate.

I tried a different approach by trying to convert mass flow rate and velocity into variables I know, such as density, A1 and A2 but I think really I'm just stuck in correctly identifying the external (body) forces on the fluid and the surface forces on the fluid.

Many thanks for any help offered!

Emma

2. Oct 29, 2009

### Aphex

I'm stuck on this very same question... any help?

3. Oct 29, 2009

### EmmaJ

You go to UNSW? Still haven't worked it out...I'll just hope it's not in the final!

4. Oct 29, 2009

### Aphex

Ha ha yeah i do. I'm thinking this question is a bit too nasty for an exam