# Find the average rate of flow of blood - artery

1. Apr 12, 2008

### AlvaCata

1. The problem statement, all variables and given/known data

The velocity v of the flow of blood at a distance r from the central axis of an artery of radius R is v=k(R^2-r^2) where K is the constant of proportionality. Find the average rate of flow of blood along a radius of the artery. (use 0 and R as the limits of integration)

2. Relevant equations

Average value formula in a closed interval using intergration

3. The attempt at a solution

I'm having difficulty finding what variable to integrate.
I'm using the math to find the average value, I integrate the equation in terms of r with the upper limit R and a lower limit of 0. My answer does come out as a single number containing variables 2R^2k/3. I don't know if this is the right way of doing the problem.