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Which is it Lemmy? (lemmy.world)
submitted 4 days ago by to c/lemmyshitpost@lemmy.world
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Ragebait answers only

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[–] 6 points 3 days ago* (last edited 3 days ago) (1 child)

This is Einstein's elevator thought experiment but with portals.

B

Also, if the cube has to emerge out of the blue portal top first it has momentum moving out of the blue portal, as seen by the blue portals frame of reference. It can't emerge with zero momentum or it wouldn't move relative to the blue reference frame.

But in portals physics the answer is A.

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  • [–] 1 point 3 days ago (1 child)

    Einstein's elevator explains why acceleration can mimic gravity. It doesn't, by itself, explain why a stationary cube would emerge with a large sideways velocity. That conclusion depends on additional assumptions about how moving portals transfer momentum.

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  • [–] 0 points 3 days ago*

    Yeah it does explain it if you use your brain for like half a second. Is the orange portal moving down to the cube or is the cube moving up towards the orange portal? We have the reference frame of the cube so it looks like the portal is approaching the cube.

    What you also conveniently forgot to mention is his thought experiment also explains relativity where you can't tell whether it's acceleration due to the elevator moving up, or gravity pressing you down in the elevator while it's stationary.

    Since you can't tell the difference between the two scenarios the cube should only do one thing in both scenarios to be consistent with relativity. If it doesn't it breaks it...

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