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seen Apr 6 at 5:42

Feb
20
comment How Would an Alcubierre Drive “ride” a Wave of Spacetime?
"The drive moves because spacetime just keeps compressing in front of it and expanding behind it with no limit. When you turn the drive off the spacetime doesn't rebound, it stays where it is so the spaceship stays in whatever location it has reached." Yes, but then what? The spaceship needs to move outside of that region to do anything useful, moving through compressed (front) sheared (side) or stretched (back) space. My question is, doesn't this take just as long? See my third paragraph in the OP.
Feb
20
asked How Would an Alcubierre Drive “ride” a Wave of Spacetime?
Jan
29
asked Import of Celestial Effects on Satellite Radio Interference
Jan
2
awarded  Popular Question
Feb
27
awarded  Scholar
Feb
27
accepted Whistle Physics
Feb
27
comment Whistle Physics
Yes; exactly. Thanks.
Feb
27
comment Whistle Physics
"If the air stream is easily deflected(unstable), vortexes are generated. If the same thing happens repeatedly, many more vortexes with similar properties will be generated. These vortexes cause air pressure to vary in a periodic way, so sound wave is produced." +1; This is the key part I'm asking about. Can you clarify how this happens for an accepted answer? Is this related to vortex shedding? I can't picture exactly how a periodic change is set up.
Feb
27
comment Whistle Physics
I think I had known this at one point, but had forgotten. Thanks for reminding me. This isn't the kind of whistle I was specifically asking about, but +1 for helping!
Feb
24
asked Whistle Physics
Oct
24
awarded  Student
Jul
28
awarded  Supporter