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```Chapter 12 | Fluid Dynamics and Its Biological and Medical Applications
Figure 12.27 The vertical tube near the water tap remains full of air and serves a useful purpose.
12.5 The Onset of Turbulence
26. Doppler ultrasound can be used to measure the speed of blood in the body. If there is a partial constriction of an artery,
where would you expect blood speed to be greatest, at or nearby the constriction? What are the two distinct causes of higher
resistance in the constriction?
27. Sink drains often have a device such as that shown in Figure 12.28 to help speed the flow of water. How does this work?
Figure 12.28 You will find devices such as this in many drains. They significantly increase flow rate.
28. Some ceiling fans have decorative wicker reeds on their blades. Discuss whether these fans are as quiet and efficient as
12.6 Motion of an Object in a Viscous Fluid
29. What direction will a helium balloon move inside a car that is slowing downâtoward the front or back? Explain your answer.
30. Will identical raindrops fall more rapidly in
5Âº C air or 25Âº C air, neglecting any differences in air density? Explain your
31. If you took two marbles of different sizes, what would you expect to observe about the relative magnitudes of their terminal
velocities?
12.7 Molecular Transport Phenomena: Diffusion, Osmosis, and Related Processes
32. Why would you expect the rate of diffusion to increase with temperature? Can you give an example, such as the fact that you
can dissolve sugar more rapidly in hot water?
33. How are osmosis and dialysis similar? How do they differ?
79
```
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