Question

Left ventricle pumping The lower left chamber of the heart (the left ventricle) pumps blood into the aorta. According to biophysical studies, a left ventricular contraction lasts about 0.20 s and pumps 88 $\mathrm{g}$ of blood. This blood starts at rest and after 0.20 $\mathrm{s}$ is moving through the aorta at about 2 $\mathrm{m} / \mathrm{s}$ . (a) Estimate the force exerted on the blood by the left ventricle. $(\mathrm{b})$ What is the percent uncertainty in your answer? (c) What assumptions did you make? Did the assumptions increase or decrease the calculated value of the force compared to the actual value?

          Left ventricle pumping The lower left chamber of the heart (the left ventricle) pumps blood into the aorta. According to biophysical studies, a left ventricular contraction lasts about 0.20 s and pumps 88 $\mathrm{g}$ of blood. This blood starts at rest and after 0.20 $\mathrm{s}$ is moving through the aorta at about 2 $\mathrm{m} / \mathrm{s}$ . (a) Estimate the force exerted on the blood by the left
ventricle. $(\mathrm{b})$ What is the percent uncertainty in your answer? (c) What assumptions did you make? Did the assumptions increase or decrease the calculated value of the force compared to the actual value?

Added by Larry P.

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