Answer to Question #43272 in Physics for dinisha

Question

the radius of the aorta is about 1.0cm and the blood passing through it has a speed of about 30cm/s while radius of a capillary is about 4 x 10^-4 cm and the blood speed that flows through is about 5 x 10^-4 m/s. how many capillaries are there in the body if blood from aorta passes through the capillaries?
A. 8 x 10^9
B. 4 x 10^9
C. 8 x 10^8
D. 4 x 10^8
E. 8 x 10^7