# Bernoullis Equation

1. May 3, 2007

### grscott_2000

When using Bernoullis equation, part of it requires velocity to be input as part of it.

I am given flow rate of 5.00 m^3 per second. I am also told the diameter of a pipe that is 0.6 m. How do I calculate velocity?

I am assuming that velocity isnt simply 5.00 m/s

I know that flow rate (Q) = Area x velocity, therefore

velocity = Q / Area

I also know that Area is pi r^2,

thus I think that velocity = 5.00 / (pi * 0.15^2) = 70.7 m per second

Is this correct?

Last edited: May 3, 2007
2. May 3, 2007

### grscott_2000

Ok, I now know the formula for solving velocity from flow rate and pipe diameter.

If anyone is interested its

4 * flow rate / (pi * (pipe diameter)^2)