An artery is constricted at one location to 1/2 its normal cross-sectional area.
how does the speed of blood past the constriction compare to the speed of blood flow in the rest of the artery? (note: assume ideal fluid flow.)

a) it is 1/4 as fast
b) it is 1/2 as fast
c) it is 2 times as fast
d) it is 4 times as fast

  v₂ = 2 v₁   blood velocity in the built zone is twice the speed of the normal zone,   so the correct response is c

Explanation:

For that problem we must use the fluid continuity equation

          A₁ v₁ = A₂ v₂

Where point 1 is in the normal artery and point 2 in the contraction

         v₂ = v₁  A₁ / A₂

In the exercise indicates

          A₂ = ½ A₁

          v₂ = 2 v₁

The blood velocity in the built zone is twice the speed of the normal zone, so the correct response is c

e

explanation:

there is no change in the electric potential energy as it is in rest on both conditions.

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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