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O.P. RE: CDs spinning at 35000 rpm
the real truth about the glass: Well, in fact any frequency can break the glass, but the loud of that sound/noise should be very very very high for the most of frequencies. It should be so loud that maybe it's impossible to create that sound.
However each object (a glass in particular) has an associated frequency that is called resonancy frequency (sorry if the translation is dodgy) That is a special frequency beacuse the object, due to its form, the materials it's made in, etc..., amplifies a lot the power of the sounds with that frequency and then a little/medium loud of that sound can break the glass "easyly".
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