The pressure drop along a length of artery is 100 pa, the radius is 10 mm, and the flow is laminar. the average speed of the blood is 15 mm/s. (a) what is the net force on the blood in this section of artery? (b) what is the power expended maintaining the flow?

(a) Net force on the blood is 0.0314 N

(b) Power expanded is W

Explanation:

Given that,

"Pressure drop" along a length of "artery" (P) is 100 Pa =

The radius (r) is 10 mm = 0.01 m

"Velocity" of the blood is 15 mm/s = 0.015 m/s

(a) Calculation of Net force:

We know that,

Net force on the blood at the given section is equal to "pressure at the given section" times "area of the given section".

Area is

Plug the given values in the above formula,

Net force = 0.0314 N

(b) Calculation of Power:

We know that,

W

answer; i believe that the correct answer is (d) a very small amount of mass