Physics, 20.12.2019 22:31 arturo698839

Acylindrical blood vessel is partially blocked by the buildup of plaque. at one point, the plaque decreases the diameter of the vessel by 67.0 %. the blood approaching the blocked portion has speed v 0 . just as the blood enters the blocked portion of the vessel, what is its speed v , expressed as a multiple of v 0 ?

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Answer from: KKHeffner02

speed of flow of blood in the blocked portion of the vessel is 9.18 vo

Explanation:

given data

diameter of the vessel = 67.0 %

to find out

what is its speed v expressed as a multiple of vo

solution

we know here that Plaque decreases diameter of the vessel by 67%

s here diameter in the blocked portion = 33% of diameter in unblocked portion so

we will apply here Continuity equation that is express as

Ao×Vo = A1×V1 ...................1

here Ao is Cross-sectional area of the cylindrical blood vessel that is = $\frac{\pi do^2}{4}$

and do is Diameter of the cylindrical blood vessel and vo is Speed of flow of blood in the blood vessel

and d1 is diameter of the vessel in the blocked portion of the vessel that is = 0.33 do and A1 is cross section area of the vessel in the blocked portion that is = $\frac{\pi d1^2}{4}$ and v1 is Speed of flow of blood in the blocked portion of the vessel

so now we put value in equation 1 we get

Ao×Vo = A1×V1

$\frac{\pi do^2}{4}$ × vo = $\frac{\pi d1^2}{4}$ × v1

do²×vo = d1²×v1

do²×vo = (0.33 do)²×v1

solve it we get

v1 = 9.18 vo

so speed of flow of blood in the blocked portion of the vessel is 9.18 vo

Answer from: Quest

Answer: it will take 4.36 seconds to reach her average velocity 10.69 miles/hour.explanation: we have equation of motion $s=ut+\frac{1}{2} at^2$ ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/s $s=0*t+\frac{1}{2} *2.18*t^2$ $s=1.09t^2[/ 2equating equation 1 and 2 [tex]4.75t = 1.09t^2\\ \\ t=4.36 seconds.$ so it will take 4.36 seconds to reach her average velocity 10.69 miles/hour.

Answer from: Quest

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."

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