Eli5: how does this apple float in place, and why does it also explode?

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So there’s this video I just watch. Can someone explain to me how this apple floats in place, and why it doesn’t drop or fly somewhere else? And why is it when the RPM of the apple gets higher it explodes?

Video:
[Apple grenade](https://youtu.be/HcNsQyDaVng)

In: Physics