Pousseille Rate flow question blood vessel

[futuremd2012]

Relating to Pousseille's Law:

Let's say you increase the blood vessel radius by 50%, and in order to keep the same pressure difference at points, what must increase by?


I can't figure out... V (flow rate, for ex)=...(p2-p1)r^4

so ((3/2)^4)^-1)??

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