I\'m not sure if my answers for 1-3 are correct but that is what I think it is.
ID: 1554029 • Letter: I
Question
I'm not sure if my answers for 1-3 are correct but that is what I think it is. The other two, I am not sure how to do.
D Question 1 1 pts In a non ideal flowing fluid, what will happen to the combination of kinetic, gravitational potential energy, and elastic potential energy of the water over time? O The sum of these energies will decrease over time The sum of these energies will remain constant The sum of these energies will increase over time D Question 2 1 pts What is the cause for this change in energy? o Work done by friction Work done by gravity O Work done by the fluid force Work done by normal forceExplanation / Answer
Your answers for the 1st 3 are right. The 3rd question's logic is used to answer the rest.
Since the build-up of fat has narrowed the cross-section, we have to apply continuity equation A1V1=A2V2.
A2=cross section of the narrowest point. V2=Velocity at the narrowest point. A1-Cross sectional area before constriction, V1=Velocity before constriction.
V2=A1V1/A2. Since A2 is smaller than A1, V2 is higher than V1. Hence the velocity is largest at the narrowest point.
Pressure =Force acting per unit area. i.e Force/Area. Since the narrowest point has the least cross sectional area, the blood pressure will be the largest at this point only. The force acting throughout is uniform, but the area is varying. Hence the narrowest point having the least area of cross section will experience the largest amount of force.