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Author Topic: Can you arrange magnets and a compass in a way that..  (Read 13575 times)

lyner

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Can you arrange magnets and a compass in a way that..
« Reply #25 on: 04/04/2008 19:53:44 »
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permanent levitation should be achievable
Bored Chemist has achieved that. Nothing different, in principle between that and a mass hanging on a spring (although very ingenious, BC - respect).

There is always some interaction with other matter and some finite Kinetic Energy will always be transferred from even your moving deep deep space object. So, there will not be perpetual motion - however long the motion lasts for.
Where there is motion there is KE  but where there is equilibrium there is not necessarily KE so there is no work done and so there is no loss of energy; no principle is violated. So perpetual levitation is quite ok as a thought experiment.
« Last Edit: 04/04/2008 19:55:36 by sophiecentaur »
 

Offline Bored chemist

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Can you arrange magnets and a compass in a way that..
« Reply #26 on: 05/04/2008 01:32:14 »
I can take credit for the implementation, but not the idea.
I saw that someone had dome this and I basically copied it because I thought it looked really neat.
"So perpetual levitation is quite OK as a thought experiment."
Did you mean perpetual motion?
Incidentally there's some evidence that energy will be lost as "gravity waves"
 

lyner

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Can you arrange magnets and a compass in a way that..
« Reply #27 on: 06/04/2008 18:40:43 »
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Did you mean perpetual motion?
No, I meant what I said. Perpetual motion involves energy transfer - involving loss.
Levitation (static) involves no transfer of energy so I reckon it involves no loss - even by gravity waves, which (?) radiate when there is a change in GPE.
 

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Can you arrange magnets and a compass in a way that..
« Reply #28 on: 06/04/2008 19:56:41 »
In that case, never mind it being a thought experiment, I have got two on the table. The complicated one with the magnets pictured earlier, and the much more common type. There's a book on the table mysteriously held up in spite of gravity. Most people would just say it's resting on the table. I think it's the exclusion principle.
 

lyner

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Can you arrange magnets and a compass in a way that..
« Reply #29 on: 06/04/2008 21:31:31 »
Har har. I'll exclude you from my Christmas card list, matey.
 

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Can you arrange magnets and a compass in a way that..
« Reply #29 on: 06/04/2008 21:31:31 »

 

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