Switchable Binding
Most recent answer: 09/20/2013
- Mia Dall (age 20)
Denmark
It's easy to understand your near-perfect English, but it's not completely clear what sorts of things would be allowed in the switch controlling this binding. Is there an actual application in mind?
No "command" can be made using exactly zero power, but we can try to think of ones in which a switch can be made with very low energy input, much less than the energy that would be required to actually pull the objects apart. With that constraint, I don't think it's possible to make something that can be switched back and forth the way you want.
Here's an argument. Let's say the switch can be on ("N") or off ("F"). The two objects can either be bound ("B") or apart ("A"). So we have four states : NB, NA, FB, and FA.
Each state will have some energy*:
ENB, ENA, EFB, and EFA.
We want the on switch to bind the things, so we need:
ENB < ENA,
because things go toward the low-energy state, just like things roll downhill.
Likewise we want the things to be apart when the switch is off, so we need:
EFB > EFA.
If we want to be able to throw the switch either way without much energy input, we need
ENB ≈ EFB and EFA ≈ ENA.
Putting those together we get:
ENA ≈ EFA > EFB ≈ ENB, so ENA > ENB.
But we started with the opposite requirement:
ENB < ENA.
So I don't think there's any such system.
Mike W.
* free-energy, for the picky.
(published on 09/20/2013)