# Poiseuille's law!

• Sep 8th 2011, 07:08 PM
habibixox
Poiseuille's law!
Biologists have found that the speed of blood in an artery is a function of the distance of the blood from the artery's central axis. According to Poiseuille's law, the speed of blood that is r cm from the central acis of an artery is given by the function:
S(r)= C * (R^2 -r^2)
where C is a constant and R is the radius of the artery. Suppose that for a certain artery, C= 1.76 * 10^5 cm/sec and R = 1.2 * 10^-2 cm.

a. computer the speed of the blood at the central axis of this artery.
b. computer the speed of the blood midway between the artery's wall and central axis.

• Sep 8th 2011, 07:30 PM
TKHunny
That's a lovely algebra problem. Where's the Calculus?

"at the central axis" means r = 0

"midway" means r = R/2

Plug'n'chug.
• Sep 8th 2011, 07:33 PM
habibixox
I really stink at word problems. Do you have any tricks to solve these problems better?
If you just told me to do so flat out I would obviously know how to do this!
How embarrassing :(
Thank you.
• Sep 8th 2011, 08:56 PM
CaptainBlack
Quote:

Originally Posted by habibixox
I really stink at word problems. Do you have any tricks to solve these problems better?
If you just told me to do so flat out I would obviously know how to do this!
How embarrassing :(
Thank you.

Interpret the questions in terms of the notation given, if no notation given invent some.