Am 20.02.2013 03:02, schrieb H. Karsten:
> Any ideas to that?

"...what energy is turning the wheel"?

None, because it won't work that way.

Superconductors don't conduct energy - they conduct electrons, which 
/are/ matter.

As such, they have a mass, and this mass needs to be lifted up against 
gravity in the left part of the image.

That aside, let's look at what would happen /if/ pure energy was 
conducted (let's say in the form of electromagnetic waves, i.e. 
photons), and /if/ we could convert energy to matter and back at will:

Note that the blue "converter" is a bit closer to the source of gravity, 
meaning that the gravitational field is stronger there. Stronger 
gravitational field, however, means time dilation: Any process happening 
at the blue "converter" is a tiny bit slower than at the red one.

Also note that the energy of a single photon depends on its frequency: 
The higher the frequency, the more energetic the photon is.

Now let's assume the blue "converter" emits energy in the form of a 
Photon at 1 GHz towards the red "converter".

But due to time dilation down at the blue "converter", from the 
perspective of the red one the frequency isn't 1 GHz: Rather, it might 
be something like 0.9999999999 GHz.

Thus, when the energy arrives at the red "converter", it isn't as much 
as the blue one sent out.

If we then convert the energy into matter, and let it fall free back 
towards the blue "converter", by the time it hits the converter its 
kinetic energy will equival exactly the amount lost during the "upward" 
transfer.

If we don't allow the matter to fall free, and instead try to drive a 
wheel with it, the matter will be slowed in its fall, so that when it 
hits the blue "converter" again it will not have fully compensated for 
the "upward" loss.

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