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Spinning apple with compressed air until it explodes.
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Previously:
https://www.homemadetools.net/forum/...762#post198115
https://www.homemadetools.net/forum/...863#post190791
https://www.homemadetools.net/forum/...581#post170360
https://www.homemadetools.net/forum/...865#post140419
I am not buying that!!!! There had to be at least a superficial cut in the skin of the apple for it to break that cleanly.
Spinning a CD until it explodes.
https://www.youtube.com/watch?v=zs7x1Hu29Wc
Each time you see the explosion, it appears to originate at one very specific spot along the edge. Perhaps a nick along the edge from when the CD was living it's normal life.
The results can certainly be devastating when the over spun object has some mass to it. A quick search for "Flywheel Explosions" trans up some interesting eye opening events.
https://www.youtube.com/watch?v=y7gKbk0jyyM