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submitted 5 months ago* (last edited 5 months ago) by FatTony@lemmy.world to c/asklemmy@lemmy.world

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[-] DeLacue@lemmy.world 20 points 5 months ago

Given that the speed of light is the upper limit for changes to propagate through the universe; if you had a four light-year long indestructible rod and you move one end of the rod how long until the other end moves?

[-] Inductor@feddit.de 15 points 5 months ago

I'm not an expert, but I guess it would depend on the speed of sound in the rod.

[-] chetradley@lemmy.world 7 points 5 months ago

This crashes the simulation.

[-] loudWaterEnjoyer@lemmy.dbzer0.com 4 points 5 months ago

Well not above the speed of light, if I read the first sentence correct.

[-] DigitalDruid@lemmy.sdf.org 4 points 5 months ago* (last edited 5 months ago)

4 light years, the universe won't allow anything else.

[-] hydrospanner@lemmy.world 5 points 5 months ago

That's distance, not time.

[-] DigitalDruid@lemmy.sdf.org 3 points 5 months ago

you're right, I meant 4 years as aboundary even if that's actually high.

Since it's a hypothetical material we don't know what max speed information can travel through it and the actual answer would be related to that, so a lower boundary at 4 years anyway.

If the material was truly somehow magically incompressible then I expect we would see some kind of time dilation so that the information could move at the right speed without deforming the rod. It would still take at minimum 4 years.

[-] pete_the_cat@lemmy.world 3 points 5 months ago

[-] tostiman@sh.itjust.works 2 points 5 months ago

Instantly, unless the rod flexes

[-] ripcord@lemmy.world 1 points 5 months ago

Somewhat related: let's say you're moving at 80% the speed of light away from earth. Then you turn on a flashlight and point it away from earth.

How fast is the light emitted moving relative to you?
How fast is it moving relative to earth?

this post was submitted on 23 May 2024

636 points (96.1% liked)

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