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## Homework Statement

Using the data of Example 10-11, calculate the average speed of blood flow in the major arteries of the body, which have a total cross-sectional area of about 2.0cm

^{2}

## Homework Equations

well... Actually, I don't know how to solve this problem.

The Example 10-11 gives some of datas.

"The blood returns to the heart via the veins. The radius of the aorta is about 1.2cm, and the blood passing through it has a speed of about 40cm/s. A typical capillary has a radius of about 4 x 10

^{-4}cm, and blood flows through it at a speed of about 5 x 10

^{-4}m/s.

## The Attempt at a Solution

I do now know what should I use equation first, so would you explain detail to me to learn how to solve this problem easily. Please answer the questions!!!