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Most of my students are not familiar with the idea of a Mach number.
I still use examples like this because it helps some of the students
but I must constantly remind myself that I need to do more to "reach"
others. Like Dr. Rauber, when I was in high school most everyone had a
common base experience that teachers could use as examples. I find
that today very few students have this common base - many have never
opened the hood of a car much less worked on one, many do not play
sports so they do not have a "feeling" for related projectile motion,
etc. This means that I must spend class time giving them a common
experience with an activity - a "lab". Even then I must often point
out observations that I think are obvious but they think are very
subtle.