W3 - Flow

What is the correct formula for viscosity?

• Q = (ΔPπr^4)/(8ηL)

• F =(ηAv)/L

• V=AvL

• P = pgh

What does the rate of flow not depend on?

• Pressure differnece

• viscosity

• volume of fluid

• radius of tube

hat assumption(s) are made for Poiseuille's Equation? (may be more than one right answer)

• laminar flow

• The fluid must have a density of 1000kg/m2

• constant pressure

• incompressible fluid

If the radius of a tube increases a factor of 4, what can be said about flow rate?

• It increases by a factor of 4

• It increases by a factor of 16

• It decreases by a factor of 4

• It increases by a factor of 256

Answer explanation

Q is proportional to r^4, increasing r by a factor of 4, r -> 4*r means Q increases by (4*r)^4/r^4 = 4^4 = 256

Which of the following describes the Bernoulli effect?

• If speed decreases, pressure increases for a constant height

• If speed increases, pressure is constant for a constant height

• If speed decreases, pressure decreases for a variable height

• If speed increases, pressure increase for a variable height

What part of the circulatory system has the highest velocity of blood flow?

• Capilliaries

• Vena Cava

• Venules

• Aorta

An artery is partially blocked. What effect would this have on the blood flow through the artery (choose more than one)

• Blood speed increases through the blockage

• There is a lower blood pressure after the blockage

• the blood vessels relax, increasing length

• artery dilation occurs increasing blood flow again