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Post Reply Free fall in space(Myth)
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Posted 11/9/17 , edited 11/9/17
Imagine being in space, no light, just darkness, in the vacuum. You could be moving at 100m/s, you could be moving at light speed or faster, or you could be stationary, how can you tell?
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Posted 11/9/17 , edited 11/9/17
You can't, because you'd be dead.
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Posted 11/9/17 , edited 11/10/17

Werning wrote:

You can't, because you'd be dead.


Vacuum yes, light speed no
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Posted 11/9/17 , edited 11/10/17

fredreload wrote:


Werning wrote:

You can't, because you'd be dead.


Vacuum yes, light speed no


Light speed vacuum?
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Posted 11/9/17 , edited 11/10/17

Werning wrote:


fredreload wrote:


Werning wrote:

You can't, because you'd be dead.


Vacuum yes, light speed no


Light speed vacuum?


Ya, well, the reason that light speed kills is because of acceleration. So if you accelerate slowly it shouldn't kill. And the limit of current technology and in the straight path without colliding with asteroid. Overall good, light speed vacuum is the answer.

P.S But this is another topic, if you are in complete darkness in a vacuum, you wouldn't know if you are moving or not, keep in mind that without air your clothes wouldn't move either. This seems to be a three dimensional structural paradox, but you got the element of time

P.S When Loki is free falling in Thor 3 because of Dr. Strange, he kept track that he was falling for 30 minutes, I got the idea from there. And of course this isn't the only free fall concept in a movie, there's also Timon and Panbaa from Lion King and many others.
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Posted 11/9/17 , edited 11/10/17
You are full of this stuff called "liquids". They tend to move about and generally let you know you are going somewhere. There is a point where you will notice the pressure of the procedure.
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Posted 11/9/17 , edited 11/10/17
Not entirely sure but I think it is like this:
you only perceive acceleration, not speed. If you sit quietly in your chair you are still moving very fast because 1. the earth is rotating and 2. the earth is moving very fast through space.
so, provided you survive etc, you cannot notice that you are moving if you don't have a reference that is at a different speed
mxdan 
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Posted 11/10/17 , edited 11/10/17
https://en.wikipedia.org/wiki/Vestibular_system

And acceleration feels just like gravity. In fact it's indistinguishable.
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Posted 11/10/17 , edited 11/10/17
In both relativity and Newtonian physics there is no objective standard of no moving. Things only have a speed relative to other things. In Newtonian physics you can add the same velocity vector to everything and the results will be the same plus that vector. In relativity the transforms on the data is more complicated. It's something like an abstract rotation. Observers won't even necessary agree on the difference of velocity between two things. They will agree on the square root of the difference time x light speed all squared and spacial distance squared. When you put in a distance and time that match with a light speed path you get 0. All observers will agree that something is moving at light speed or agree that it is slower or agree that it is faster.

Something in orbit is following the analogy of a straight line in spacetime, and won't feel acceleration. The feeling of weight comes from things like the ground getting in the way. You are being accelerated up all the time but space is essentially flowing into the ground so you stay put. If you were on a spaceship accelerated at one g, it would be the same.
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Posted 11/10/17 , edited 11/10/17
Generally you can't feel the difference between 0 gravity and free fall. They feel the same
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Posted 11/10/17 , edited 11/10/17
From what I understand, objects normally cannot be accelerated to the speed of light because to do so would require infinite energy to accelerate the increasing mass of the object.

The original question asked by the OP is interesting though. The speed of light doesn't change because of the reference frame of an object, so if you could find the difference between the velocity of your current reference frame and light, then you would have your answer right there. The problem is that I don't know enough about how to calculate this difference. An interferometer would allow you to measure the speed of light by the interference pattern it creates. For example, a Fabry-Perot interferometer uses the length of the cavity and the speed of light as a parameter to calculate the round trip time of a photon in the cavity. I've forgotten my laser physics since I took the class all those years ago, but the interference pattern will create modes that can be measured by detecting an oscillation at a particular frequency. The difference in value between these frequencies will allow you to perform the calculation, (the details of which I forget.)

I can't think of how you would measure the difference between the speed of light and an object's velocity though.

Edit: I remembered an exception. I don't know anything about astrophysics, but galaxies can move away from each other faster than the speed of light, because it is the space itself that is expanding. I... don't know anything about this subject though.

https://www.google.com/search?source=hp&ei=BzUGWs3nK4KA0wKXyKBw&q=expanding+universe+faster+than+light&oq=expanding+universe+faster+than+light&gs_l=psy-ab.3...470.5488.0.5693.0.0.0.0.0.0.0.0..0.0....0...1.1.64.psy-ab..0.0.0....0.o9Y2HR4PeIc

Also, from basic physics, the speed of light can be different, depending on the index of refraction of the object. But that's not what people are talking about when they say the speed of light never changes.
qwueri 
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Posted 11/10/17 , edited 11/10/17
Presumably you track visual references such as stars or other visible objects. However without some previous experience moving at a particular speed with a tool measuring that speed, even approximating the speed seems unreasonable.
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Posted 11/10/17 , edited 11/10/17

fredreload wrote:
Imagine being in space, no light, just darkness, in the vacuum. You could be moving at 100m/s, you could be moving at light speed or faster, or you could be stationary, how can you tell?


Space isn't a perfect vacuum. You'd get torn apart by micro asteroids and other particulates. On top of all the other horrible things happening to you anyway. Space is full of fun and amazing ways to die.

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Posted 11/10/17 , edited 11/11/17
Only way to tell is to compare it to some light. Heck as our planet rotates it also rotates around the sun which rotates around a cluster of stars which rotates in an arm which rotates around the galaxy which rotates around galactic clusters which probably rotate around something else. We might already be going light speed.

Why are there so many people being rude and attacking him for a non-issue?
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Posted 11/10/17 , edited 11/11/17

jewishrapscallion wrote:

Only way to tell is to compare it to some light. Heck as our planet rotates it also rotates around the sun which rotates around a cluster of stars which rotates in an arm which rotates around the galaxy which rotates around galactic clusters which probably rotate around something else. We might already be going light speed.

Why are there so many people being rude and attacking him for a non-issue?


Thanks for standing up for me! Fred doesn't admit getting bullied because that makes him feels weak . While most people thinks Fred should admit to his weaknesses, he still got quite a few things to spare. Though in the end his insecurity gets to him and eventually becomes a burden to people, sigh, that's why people hate me. Lelouch that always think of a possible move to checkmate himself =/. Patience is the key. Wasn't a good student back in school, but interesting ideas should always be promoted
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