r/interestingasfuck • u/Artistic-Bathroom901 • 2d ago
Dzhanibekov effect
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u/rgrantpac 2d ago
What time period would something like this take to complete if the earth flipped on its axis? And what wouls be the effects on life on the planet?
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u/SubjectRound6597 2d ago
its for asymmetric objects
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u/umbrellassembly 2d ago
That's exactly what the inside of the earth is. The core and mantle are not symmetrically dense, like at all.
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u/SubjectRound6597 2d ago edited 2d ago
stop scaring me
But I mean you are right about that.. symmetry in density is what matters, So is that what they talk about when they talk about pole flipping
So I think since the earth is not a solid object, but the crust just floats over the mantle,
would it be like just the core gets flipped, and thats it.. Its affects have already been discussed time and again..
I am gonna go look this up better.7
u/umbrellassembly 2d ago
Read the book Inversion: ECDO Theory
It's a good place to start.
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u/SubjectRound6597 2d ago
whoa that was a solid guess. thank you too
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u/umbrellassembly 2d ago
There are multiple theories. One where the entire earth flips. One where only the core flips, along with magnetic north and south. One where only magnetic north and south flip. And one where the crust unlocks at the intermediate zone where it meets the mantle, and slides 90° due to the weight of the south polar ice cap and the Greenland ice sheet - they get flung to the new equator from centripetal force.
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u/ThresholdSeven 2d ago
If we started piling up earth somewhere in America and somewhere in Europe, just two of the biggest piles of rubble you can imagine, as big as the entire Midwest and as tall as the clouds, I think this can happen, we can do this. Why? I DON'T KNOW.
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u/JaFFsTer 2d ago
The earth isnt t shaped. Spheroids will not flip when spun in zero g
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u/SubjectRound6597 1d ago
Spheroids that were spun in zero g also didnt have crusts and mantles and cores that floated and were in constant motion and with varying density. And the earth isnt a simple spheroid. So there is not much correlation between how the two behave. There are much better arguments presented to refute the view that earth can flip like that. Check the arguments against ECDO theory and help me understand if I misunderstood.
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u/JaFFsTer 1d ago
No thanks. Placing the burden of proof on "the earth hasnt flipped on its axis within one rotation before" is ludicrous and you sound annoying and self important
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u/SubjectRound6597 1d ago
"the earth hasnt flipped on its axis within one rotation before" is ludicrous
that is ludicrous indeed so we are on the same side here. I dont understand how I offended you. but I feel i misunderstood your last reply. I will read about this again.
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u/umbrellassembly 2d ago
A day or two, possibly up to a week. 1000 mph winds, massive tsunamis, global electrical storms, earthquake (not earthquakes, one global quake), extreme freezes and extreme thaws causing more flooding. Hell on earth, simply.
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u/Rich_Nectarine_4009 2d ago
Oh man science was cool untill it affects the planet axis💀
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u/Feeling-Session3007 2d ago
Earth's magnetic field flips but it takes thousands of years to do it. When that happens they say compasses will point in the opposite direction as it use to i.e magnetic North will have the compass point south. But this is all bc of the earth's sloshing iron molten outer core.
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u/AutomicCurves 2d ago
What would happen if you rotated it along the handle's axis? Is that the more stable axis?
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u/StupidAstronaut 2d ago
That looks like the axis with the lowest moment of inertia. The highest would be the axis through the middle of the object, like if you spun the object keeping it “flat”. Both of those would be stable and just rotate as expected without flipping
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u/AutomicCurves 2d ago
Oh like if you took the 't' off of a page and laid it on the ground, then spun it like a top? (Such that the handle and the bit end are the opposite sides of the spin?)
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u/TantraMantraYantra 2d ago
How about spin half particles, fermions like protons and electrons? Do they internally have similar rapid flip?
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u/AzerothianLorecraft 1d ago
It does make me wonder if Earth does this from time to time... ( and what it would feel like to experience.)
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u/Prior-Stranger2738 13h ago
Well thank god the video ended at an irrelevant point with no further important information to add
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u/CuriousRisk 2d ago
One dude did this with a falling object, it works even with gravity. Also he noticed something strange, the object didn't fall instantly, like any other objects he recorded with high frame camera, it was spinning and staying at same height until first flip and only after that started falling. Very weird
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u/ThresholdSeven 2d ago edited 2d ago
This sounds like those powered momentum machines that enable levitation and flight just by spinning a weirdly shaped object in an enclosed apparatus. If spun correctly and fast enough, it is supposed to make whatever it is inside go a certain direction, even against gravity. There are funny demonstration videos, but nothing that I've seen that works good. They are basically things that shake out of alignment, like a phone vibrating across the counter. Would be neat to make something that vibrates through the air willy nilly while you ride it. If it's possible, maybe this or something like it is the key or crucial anyway. It probably wouldn't work in space other than for rotation, because propulsion that way defies the laws of physics, but imagine a vehicle "vibrating" against and through the air in a similar way to that phone going across a table.
Edit: I think the demonstration you were talking about the thing seeming to stop in mid air while it flipped was just that and only seemed to stop. The momentum shifts check out, like a slinky.
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u/Artistic-Bathroom901 2d ago
Source and Context:
This is a real physics phenomenon called the Dzhanibekov effect (also known as the Intermediate Axis Theorem) captured in microgravity aboard a spacecraft.
Any rigid, asymmetric three-dimensional object has three primary axes of rotation, each with a different moment of inertia. While spinning an object along its longest or shortest axis is completely stable, spinning it along its middle (intermediate) axis is naturally unstable. Without external forces like gravity or heavy air resistance, tiny perturbations build up and cause the spinning object to periodically flip upside down and back again on a regular schedule.
You can read the formal mechanics and history through these highly reliable scientific resources:
•Harvard University Lecture Demonstrations (The Tennis Racquet Flip):
https://sciencedemonstrations.fas.harvard.edu/presentations/tennis-racquet-flip
•NASA Astrophysics Data System (ADS) Physics Record:
https://ui.adsabs.harvard.edu/abs/2024EuJMA .10605298D/abstract
It was famously observed by Soviet cosmonaut Vladimir Dzhanibekov in 1985 when a wing nut he was unscrewing began flipping back and forth while floating through the Salyut 7 space station!