Estimate the maximum likely rotational speed of the bathtub vortex
created when you step out of the tub and pull the plug.
Assume typical bathtub dimensions.
Some people claim that the bathtub vortices on the northern hemisphere
rotate counter-clockwise and in the southern hemisphere clockwise.
Is this true? Are there no bathtub vortices on the equator.
If athmospheric air rises vertically, what general effect do you expect
on the wind speeds?
Make question 3.2 in the book.
Consider inviscid, incompressible, steady flow.
Are the streamlines the only lines along which the Bernoulli
law holds?
Make question 3.3 in the book.
You and a friend visit the fluids lab and are shown a running
water tunnel. Your friend claims that the surface velocity
increases as the square root of distance as it speeds up through the
narrowing duct. Certainly you can see the water speed up
downstream, but how can he see what power of distance it is?? Your
own eyes must be even better fluid measuring devices; you can find
the point where the average velocity is half the average
velocity in the measuring section. Explain both observation.
Discuss what form(s) of the Bernoulli law would apply to a running
river.
