Your last submission is used for your score. 1. [0I1Points] PREVIOUS ANSWERS SERCPWA119.WA.O76. pRAcncg ANOTHER 1 Angioplasty is a technique in which arteries partially blocked with plaque are dilated to increase blood ow. By what factor must the radius of an artery be increased in order to increase blood ow by a factor of 4, assuming l no change in pressure difference? If_ THE " See if you can find an expression which relates the volume ow rate of a fluid to the radius of the conduit for that fluid. . , , fewj , 2. [-I1 Points} PRACTICEANOTHER f '_' i when physicians diagnose arterial blockages, they quote the reduction in flow rate. If the flow rate in an artery has been reduced to 14.3% of its normal value by a blood clot and the average pressure difference has i i i l i SERCPWA1 1 9.WA.077. increased by 32.0%, by what factor has the clot reduced the radius, r0, of the artery? l r= _ 77M: PRACTICE ANOTHER SERCPWA11 9.WA.084. l , 3. [-/1 Points] Turbulence in the aorta is a certainty for a Reynolds number of 3000. Assuming that blood is an ideal fluid, calculate the average flow rate for this Reynolds number if the diameter of the aorta is 1.55 cm. Use 1.05 x 103 kg/m3 as the density and 2.054 x 10-3 (N/mz) - s as the viscosity of blood. SERCPWA1 1 9.WA.053. 4. [-I1 Points] PRACTICE ANOTHER A Veterinarian uses a hypodermic syringe like the one shown in the figure to inject a horse with a medical solution With a density that is the same as water. The barrel of the syringe has a cross-sectional area ofz.53 x 10'5 2 and before she exerts any force on the plunger, the pressure everywhere in the syringe is 100 atm. When she exerts a force with a magnitude of 3.55 N on the plunger, the medical solution squirts horizontally from the needle. Determine the speed of the solution as it leaves the needle. 'm/s S 6. [0/2 Points] DETAILS PREVIOUS ANSWERS SERCPWA11 9.WA.061. MY NOTES PRACTICE ANOTHE Plaque builds up on the walls of an artery decreasing its diameter from 1.16 cm to 0.66 cm. If the flow speed is 15.5 cm/s before reaching the region of plaque buildup, determine the following. a) speed at which blood is traveling through the plaque-constricted region 0.4633 X See if you can adapt the equation of continuity to this situation. cm/s (b) pressure change within the plaque-constricted region. (Assume the density of blood is 1050 kg/m'. Be sure to include the appropriate sign with your answer.) -100.88 X See if you can adapt Bernoulli's Equation to this situation. What would a positiveegative sign on the pressure difference tell us? Pa 7. [-/1 Points] DETAILS SERCPWA11 9.WA.047. MY NOTES PRACTICE ANOTHER The aorta carries blood away from the heart and eventually branches into a large number of capillaries that distribute the blood to various body organs. If for an average person, the aorta has a radius of 1.2 cm and blood travels through it at a speed of 36 cm/s and the capillaries have an average radius of 5.0 x 10-4 cm and blood travels through them at a speed of 0.007 cm/s, determine the approximate number of capillaries in the human body. capillaries 8. [-/2 Points] DETAILS SERCPWA11 9.WA.042. MY NOTES PRACTICE ANOTHER (a) Blood with a density p = 1.00 g/cm is flowing with a speed of 25 cm/s through an aorta with a cross-sectional area of 2.2 cm2. Determine the mass flow rate (in g/s) of blood. g/s (b) If this aorta branches to a number of capillaries which have a combined cross-sectional area of 2.6 x 105 cm, determine the flow speed (in cm/s) of the blood in the capillaries. cm/s 9. [-/1 Points] DETAILS SERCPWA11 9.WA.044. MY NOTES PRACTICE ANOTHER standard after- urgery intravenous fluid has a density of 1125 ka/m3 If during the first six hours after surgery a patient is to rec 5 x 10-3 m3 of this fluid determine the mass flow DD SC 20 F2 F3 F4 F5 F7