Why would'nt this work?
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?
This wouldn't work because the moon is more than 300k km away
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?
The problem lies in what "unstretchable" and "unbendable" means. Its always molecules and your push takes time to reach the other end. You think its instantaneous because you never held such a long stick. The push signal is slower than the light
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?
That's what he meant by we'll use sticks on the other side
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The problem lies in what "unstretchable" and "unbendable" means. Its always molecules and your push takes time to reach the other end. You think its instantaneous because you never held such a long stick. The push signal is slower than the light
You think its instantaneous because you never held such a long stick.
Speak for yourself!
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Metal is a lot heavier than wood. You'd never be able to lift it to the moon.
You should make it out of feathers. Steel is heavier than feathers.
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No, gravity is faster than light. If there was this lag, we wouldn't have stable orbits exactly because of the lag you describe. Wave functions of photons also collapse faster than light when they hit absorbent material.
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?
always had this question as a kid
And then went, draw it out, and asked.
I applaud that (and the art), good for you.(And the good people already provided answers.)
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?
why wouldn't this work
because bullets are faster than whatever the fuck speed stickman is achieving
and even bullets are slower than light -
A perfectly rigid object would be usable as a tool of FTL communication
Would it though? I feel like the theoretical limit is still c
Yes, the speed of sound in an object is how fast neighboring atoms can react to each other, and not only is that information (therefore limited to C already) but specifically it's the electric field caused by the electrons that keep atoms certain distances from each other and push each other around. And changes in the electric/magnetic fields are famously carried by photons (light) specifically - so even in bulk those changes move at the speed of light at most
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A perfectly rigid object would be usable as a tool of FTL communication
Would it though? I feel like the theoretical limit is still c
Yes, that's the point. The limit c denies the possibility of a perfectly rigid body existing physically. It can only exist as a thought experiment.
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Perhaps also worth pointing out that the speed of light is that exact speed, because light itself hits a speed limit.
As far as we know, light has no mass, so if it is accelerated in any way, it should immediately have infinite acceleration and therefore infinite speed (this is simplifying too much by using a classical physics formula, but basically it's like this:
a = f/m = f/0 = ∞). And well, light doesn't go at infinite speed, presumably because it hits that speed limit, which is somehow inherent to the universe.That speed limit is referred to as the "speed of causality" and we assume it to apply to everything. That's also why other massless things happen to travel at the speed of causality/light, too, like for example gravitational waves. Well, and it would definitely also apply to that pole.
Here's a video of someone going into much more depth on this: https://www.pbs.org/video/pbs-space-time-speed-light-not-about-light/
I think relativity demonstrates that light does have mass?
They might not have "rest mass" but they do have mass!
The eclipse experiment proved it, solar sails whilst hypothetical demonstrate it.
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I think relativity demonstrates that light does have mass?
They might not have "rest mass" but they do have mass!
The eclipse experiment proved it, solar sails whilst hypothetical demonstrate it.
Photons don't have mass, but they do have momentum.
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The problem is that when you push an object, the push happens at the speed of sound in that object. It's very fast but not anywhere near the speed of light. If you tapped one end of the stick, you would hear it on the moon after the wave had traveled the distance.
Wow, TIL that the speed of sound has this equivalence
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I swear I've seen a video of someone timing the speed of pushing a very long pole to prove this very thing. If I can find it I'll post it here.
AlphaPhoenix is definitely one of the best scientists on YouTube, that video is good.
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A perfectly rigid object would be usable as a tool of FTL communication
Would it though? I feel like the theoretical limit is still c
What about using c++ or rust?
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It can look dumb, but I always had this question as a kid, what physical principles would prevent this?
If you're openminded enough to listen to those who disagree with the standard model,
take an elastic band and twist it, that's what will happen to the stick and this travels at lightspeed,
as this is what light does. Do it fast enough and the 'elastic band'/stick/'atom on the other end' breaks. -
Perhaps also worth pointing out that the speed of light is that exact speed, because light itself hits a speed limit.
As far as we know, light has no mass, so if it is accelerated in any way, it should immediately have infinite acceleration and therefore infinite speed (this is simplifying too much by using a classical physics formula, but basically it's like this:
a = f/m = f/0 = ∞). And well, light doesn't go at infinite speed, presumably because it hits that speed limit, which is somehow inherent to the universe.That speed limit is referred to as the "speed of causality" and we assume it to apply to everything. That's also why other massless things happen to travel at the speed of causality/light, too, like for example gravitational waves. Well, and it would definitely also apply to that pole.
Here's a video of someone going into much more depth on this: https://www.pbs.org/video/pbs-space-time-speed-light-not-about-light/
Actually, the thing that applies to the pole is the speed of sound (of the pole material), which is the speed the atoms in the pole move at. Not even close to the speed of light.
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If you're openminded enough to listen to those who disagree with the standard model,
take an elastic band and twist it, that's what will happen to the stick and this travels at lightspeed,
as this is what light does. Do it fast enough and the 'elastic band'/stick/'atom on the other end' breaks.Gravity waves doesn't go faster than light though?
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You think its instantaneous because you never held such a long stick.
Speak for yourself!
Is it instantaneous though?
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Gravity waves doesn't go faster than light though?
Iirc from the 2 YouTube videos I watched light can theoretically bend thanks to gravity, black holes anyone?
