Dzhanibekov Effect
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All right physicists... can someone please explain Dzhanibekov Effect to me. Why the hell does this wingnut reverse direction and make a flip???
https://www.youtube.com/watch?v=dL6Pt1O_gSE#t=59s
and
https://www.youtube.com/watch?v=L2o9eBl_Gzw
deck of cards:
https://www.youtube.com/watch?v=fPI-rSwAQNg#t=41s
bump! anyone?
>>8144373
I remember my dynamics teacher showing us this.
Moral of the story: inertia tensors are weird.
See also: rattlebacks and gyroscopic precession.
>>8144373
>>8144453
>Moral of the story: inertia tensors are weird.
>>8144373
Here's Terry Tao explaining it
http://mathoverflow.net/questions/81960/the-dzhanibekov-effect-an-exercise-in-mechanics-or-fiction-explain-mathemat
>inb4 perpetual motion is real
>>>/x/
>>8144373
https://en.wikipedia.org/wiki/Tennis_racket_theorem
>>8144373
>>8144659
Never had a name for this phenomenon. Every classical mechanics fag should have seen this in their studies. My teacher used a book tied together as his example.
Indeed, OP, this is a fascinating phenomenon. I'm tempted to pull out the ole classical mechanics book to brush up on it. It can be shown (the proof is left as an exercise for the reader atm) that the equation of motion describing rotation around the principle axis with neither the most nor the least moment of inertia is a point of unstable equilibrium.
If I get my other work done I'll post a proof.
>>8144642
in a vacuum in space, it is...
>>8147190
Too bad hypothetical ideal vacuums don't actually exist. There goes your theory. https://en.wikipedia.org/wiki/Vacuum_energy
>>8144561
https://www.youtube.com/watch?v=h0SZZTBQmEs
aay lmao
