Silas wrote:Nobody who gets paid by the hour invents a cotton gin.
tricky77puzzle wrote:A better question is what if you place a portal on a tablet, and another portal on a smaller tablet. If you put the first tablet into the second, what would happen?
I saw this in a comic before, I just forget which one.
Elvish Pillager wrote:niolosoiale wrote:So which side of the fence would you say I'm on? Why?
The confusing one. I think you should pick a different fence.
HenryS wrote:Not true. You can certainly have differently sized portals. Repeatedly passing an object through the two portals shrinks or grows the object.
I think it might look something like this halfway through, but there's definitely some weird stuff going on here:
It makes sense that they should. Imagine that instead of pistons behind the two plates, you've got just your hands pushing them together. And between the two plates, rather than a person, there is a very hard, solid object like a diamond.telcontar42 wrote:Here's a question, in the situation described by the OP, when the two portals are close enough that the person begins pressing on himself, do the tablets that the portals are on feel a force pushing them apart?
++$_ wrote:If there is no force exerted on the plates, then by clapping the two plates together you should crush the diamond to powder. This seems absurd.
Talamor wrote:You would crush yourself. But you're welcome to try it yourself. Just let us know before you do, and if we hear nothing back we'll assume the worst.
On a somewhat related note, I've crashed the game by placing two portals on the ceiling of a place where you have to duck to get through, and then standing up under one of the portals. Your head pops out of the ceiling, and you can see your feet standing on the floor, but you are upside down. The only place I could find to do this was on the final level. And like I said, doing this and messing around with it for awhile crashed it.
Red Hal wrote:Could you, for example, go down on yourself?
++$_ wrote:Then again, portals obviously violate the principle of conservation of energy, since you can create a loop that allows you to extract arbitrary amounts of energy from the earth's gravitational field.
phlip wrote:Re: Pushing a portal through another portal.
OK, so say we do it in the way Xanthir mentioned. We put the orange portal on the wall, with the usual orientation, and the blue portal on an oval-shaped piece of wood, which we hold such that the major axis points toward the orange portal ("bottom" first), the minor axis is vertical, and the opening faces left.
Now, as we start shoving the blue portal through the orange portal, the bottom of the blue portal will stick out of the middle of the blue portal. It will be horizontal, opening down (if you stick the blue portal into the orange one "top" first, then it would be facing up. Interestingly, whether you hold the blue portal so it faces left or right would have no effect here). For convenience, I'll call the part of the blue portal that hasn't gone through the orange portal yet (the part we're holding) just "the blue portal", and the part of the blue portal that has gone through the orange portal "the second blue portal".
As we get the blue portal close to halfway through the orange portal, the second blue portal will have stuck out far enough to not fit through the orange portal, and will hit the wall. As you keep pushing forward, you'll feel something lifting the far end of the blue portal (the image of the wall as viewed through the orange portal is moving up, and the far end of the blue portal is resting on it). As the blue portal angles up, the second blue portal will angle towards you. Since the plane of the blue portal is still vertical, the second blue portal will also rotate to match the first blue portal, around the left-right axis (that is, your left and right, not any of the portals').
I'm not sure what will happen after this... the second blue portal is no longer perpendicular to the wall, so I think the forces will try to rotate it around its major axis... which'll do the same to the first blue portal, which'll twist it to be no longer vertical, and then the second blue portal will be sticking out at a strange angle... the 3D visualisation section of my brain is shutting down.
Still the whole idea of light cones goes out the window with portals. You can get an object a distance x away in time < x/c. This seems problematic to me. Maybe just because its been ingrained in me that it should not happen.davetp425 wrote:My understanding is that no actual ftl travel takes place as the object never exists in the space separating the portals.
telcontar42 wrote:Still the whole idea of light cones goes out the window with portals. You can get an object a distance x away in time < x/c. This seems problematic to me. Maybe just because its been ingrained in me that it should not happen.davetp425 wrote:My understanding is that no actual ftl travel takes place as the object never exists in the space separating the portals.
telcontar42 wrote:You can get an object a distance x away in time < x/c.
jestingrabbit wrote:I think light cones are still sensible things to think about, they're just not particularly cone shaped.
jestingrabbit wrote:You could have the portal do a sort of delay thing, which didn't violate c and which didn't have an "internal length" thing, but which did make some parts of a thing "not exist" for some time, and "double exist" at other times.
jestingrabbit wrote:Also, I think you don't ever get field strengths that are infinite, because fields propagate at c, so even if you have a wire with current passing through it, which has magnetic field falling off as 1/r if I remember correctly, between two portals, the magnetic field around it will be finite but always increasing as t->infty. And probably quite a weird shape to that field, too.
davetp425 wrote:It depends on how you define distance. If by distance you mean the shortest path through space then the shortest distance may be through a portal; the portal just connects two previously separate parts of space and makes them just as adjacent as what we normally think of as adjacent. If you close your eyes and go through a portal you won't really notice that you appear to have teleported, and the whole time you'll have been going less than c.
Cauchy wrote:There's nothing stopping the objects holding the portals from moving closer together, since all the repelling forces being applied by the object that's being crushed down are being applied to other parts of the object. So I think the thing would collapse into a singularity. This shouldn't be terribly surprising, since it's not like portals obey the laws of physics normally anyways.
Blatm wrote:afarnen wrote:There would be a very thinly spread out mass of guts inbetween the portals (as thin as the largest molecule in your body).
I have a problem with this. What is stopping the walls at this point?
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