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In this video where a CD is spun abnormally fast to the point of shattering, one notices from the writing on the CD that the surface is spinning faster than the warp "shape" is. In other words, the shape the CD has warp into is moving in a circle, but not quite as fast as the surface of the CD. What's the explanation behind this de-synchronization?

I would expect the warp shape to either not spin much at all, or spin at the same speed as the surface of the CD.

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    $\begingroup$ it looks like that the deformations are vibrational modes, if so they should travel at the sound speed of the CD, not at the rotating speed $\endgroup$
    – user83548
    Commented May 16, 2016 at 16:37
  • $\begingroup$ Although cracks travel at the speed of sound in the medium, and from the rest of the video this is clearly much much faster :) The waves are travelling at a much slower speed. Observing the video it seems to be 5 to 6 times slower than the rotation of the disk. If I can come up with a reason for this I'll post an answer. $\endgroup$
    – Klodd
    Commented Jan 18, 2018 at 18:02

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