Mathematics, 10.09.2019 04:20 pinklover2002
When blood flows along a blood vessel, the flux f (the volume of blood per unit time that flows past a given point) is proportional to the fourth power of the radius r of the blood vessel:
f=kr4(this is known as poiseuille’s law; ) a partially clogged artery can be expanded by an operation called angioplasty, in which a balloon-tipped catheter is inflated inside the artery in order to widen it and restore the normal blood flow. show that the relative change in f is about four times the relative change in r. how will a 5% increase in the radius affect the flow of blood?
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and similarly the relative increase in R is given by 
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