The volume flow rate in an artery supplying the brain is 4.20 10-6 m3/s.
(a) If the radius of the artery is 5.90 10-3 m, determine the average blood speed. (in m/s)
(b) Find the average blood speed at a constriction in the artery if the constriction reduces the radius by a factor of two. Assume that the volume flow rate is the equal as that in part (a).