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a small blood veasel near the skin surface has a radius of 10um, a length of...

a small blood veasel near the skin surface has a radius of 10um, a length of 1mm and the pressure drop along the blood vessel is 2.5 Pa. The viscosity of blood is 2.7x10-3 N s m-2.
A.) what is the volume flow rate of blood through this blood vessel? what is the velocity of blood flow? Answer F=3.64x10-12m3 s-1 v= 0.012ms-1

B.)vasodilation causes the radius of this blood vessel to increase to 12um, while leaving the pressure drop along the vessel unchanged. What is the volume flow rate through this vessel now? What is the velocity of blood flow?
Answer F= 7.55x10-12m3s-1
v=0.017ms-1
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