I Create movement from leveraging the propagation of magmatism

seb7
Messages
66
Reaction score
0
TL;DR Summary
Create movement from leveraging the propagation of magmatism
Imagine two electro-magnets about a metre apart aimed at each other. We turn one of them on, and are able to watch the magnetism propagate in slow motion. The moment the magnetism reaches the second electro-magnet, we turn this on (in a manner in which it attracts), and turn the first one off. Am I correct in that only the second one would move towards the first one?

As the magnetism from the second electro-magnetic propagates back to the first one, the first one in turned on, but in an opposite current, creating repulsion, while the other electro-magnetic is turn off. Am I correct in that now only the electro-magnetic which is on is being repelled?

ie. would putting this setup inside a box, and oscillating power in this manner (at around 149mhz?) generate one directional movement?

Seb
 
Physics news on Phys.org
seb7 said:
would putting this setup inside a box, and oscillating power in this manner (at around 149mhz?) generate one directional movement?
If you mean, without emitting anything to conserve momentum, then no. You can't violate conservation laws.
 
PeterDonis said:
If you mean, without emitting anything to conserve momentum, then no. You can't violate conservation laws.
yep I understand this, but where's the flaw?
 
seb7 said:
where's the flaw?
I don't know. Have you tried to actually do the math?
 
PeterDonis said:
I don't know. Have you tried to actually do the math?
I don't know of any equations that take into account the propagation of these forces
 
seb7 said:
I don't know of any equations that take into account the propagation of these forces
Then your first step should be to learn them. Once you have, if you work through the math for the scenario you posed and still can't see how momentum is conserved, then you can start a new thread with a much more specific question based on actual math, and therefore a much better basis for PF discussion.

In the meantime, this thread is closed.
 
OK, so this has bugged me for a while about the equivalence principle and the black hole information paradox. If black holes "evaporate" via Hawking radiation, then they cannot exist forever. So, from my external perspective, watching the person fall in, they slow down, freeze, and redshift to "nothing," but never cross the event horizon. Does the equivalence principle say my perspective is valid? If it does, is it possible that that person really never crossed the event horizon? The...
ASSUMPTIONS 1. Two identical clocks A and B in the same inertial frame are stationary relative to each other a fixed distance L apart. Time passes at the same rate for both. 2. Both clocks are able to send/receive light signals and to write/read the send/receive times into signals. 3. The speed of light is anisotropic. METHOD 1. At time t[A1] and time t[B1], clock A sends a light signal to clock B. The clock B time is unknown to A. 2. Clock B receives the signal from A at time t[B2] and...
From $$0 = \delta(g^{\alpha\mu}g_{\mu\nu}) = g^{\alpha\mu} \delta g_{\mu\nu} + g_{\mu\nu} \delta g^{\alpha\mu}$$ we have $$g^{\alpha\mu} \delta g_{\mu\nu} = -g_{\mu\nu} \delta g^{\alpha\mu} \,\, . $$ Multiply both sides by ##g_{\alpha\beta}## to get $$\delta g_{\beta\nu} = -g_{\alpha\beta} g_{\mu\nu} \delta g^{\alpha\mu} \qquad(*)$$ (This is Dirac's eq. (26.9) in "GTR".) On the other hand, the variation ##\delta g^{\alpha\mu} = \bar{g}^{\alpha\mu} - g^{\alpha\mu}## should be a tensor...
Back
Top