Blood travels from the heart to the tissues and organs of the body through blood vessels that

They continually branch from each other and become smaller in diameter. In the capillaries, the vessels

smaller blood vessels, the exchange of nutrients and other substances takes place between the blood and the interstitial fluid. Oxygenated blood from the heart begins in the aorta, which has a diameter

about $2$ cm and through which blood circulates at a speed of $33$ cm$/$s$.$ In contrast, an average capillary has a diameter of $8$ mm and blood travels through it at a speed of about $0\mathrm{.}3$ mm$/$s$.$ Which

is the order of magnitude difference in the kinetic energy velocity of blood between the aorta and a

capillary? Calculate the kinetic energy velocities of the blood in these vessels in units of W and Btu$/$s$.$

The density of blood is $1\mathrm{.}056$ g$/$cm$3.$