Consider a blood vessel with radius .01 cm, length 3 cm, pressure difference 3000 dynes/(sq cm), and viscosity $\eta$=.027.

Find the velocity of the blood along:
(a) the center line $r=0$
(b) at radius $r=.005$ cm, and
(c) at the wall $r=R=.01$cm
(d) Find the velocity gradient at $r=.005$.

(a) cm/s
(b) cm/s
(c) cm/s
(d) (cm/s)/cm