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Speed of light question..
    #9300907 -

I was thinking about this earlier today.. Say your traveling in your car at the exact speed of light.. You decide to turn on your head lights. What happens?!?! The only i could come up with is.. that the coil somehow activates as usual but the light.. energy/particles never get the chance to break away from the coil.. its so confusing..

also, speaking of the matter of light.. i heard that nobody knows if light is an energy or if it abtains actual mass.. is this ture?? any input??


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Experience my nightmarish first time of smoking Ganja!


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Re: Speed of light question.. [Re: tripp23]
    #9300955 -

Well you cant travel at the speed of light, so there is nothing you could say about what you see.  But you can go real close to it, like 99.99%.  So what speed would you observe the light at while in the car? 3*10^8, the speed of light.  Doesn't matter how fast you are going, you always observe it that way.  A person in a moving rocket and a person on the ground would each observe the same photon going at the 3*10^8.  It pretty crazy shit, and doesn't make intuitive sense (which is why its so cool).

Light does have energy, plants use it right.  But mass, no.  That why it, and only it, can travel at the speed of light for various other reasons.  (Sometimes you hear conflicting things about lights mass, but thats just using different definitions of mass.  The standard idea people have about mass is known as rest mass and light has none of that.)

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Re: Speed of light question.. [Re: tripp23]
    #9300972 -

interesting. i like to think of light as its own dimension that intertwines the 3 dimensions our minds perceive.

as far as your question, if light is a dimension than you cannot 'travel' as fast as it. you can approach it however, and since your velocity has zero difference with the light components/coils velocity, im thinking you would still see light as the light wave will always travel faster than you, maybe not much light depending on your percentage of light speed you are at, but it would definitely be there.

who knows for sure though right? lol

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Re: Speed of light question.. [Re: hazey]
    #9301099 -

In space, if you have a flashlight and point it away from you while holding it, eventually you will be propelled.

Thus, you're going the speed of light, flip on the headlights and emit light directed, by way of electric or magnetic flux, whatev, in the direction that you are heading, you will be ever so slightly propelled backwards, and the light, I feel, would begin, ever so slowly, to stretch out in front of you, while consistently propelling you backwards, ever so slightly.

I think.

Also, if going the speed of light, couldn't you see like...the star's light right next to you, like a series of pictures?  Up close, regardless of distance away.  It'd be going the opposite way than you would be going, so it'd be passing you at that instant..maybe?


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you just need money to get laid - starfire_xes

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Re: Speed of light question.. [Re: Tri High]
    #9301309 -

If you were traveling very close to the speed of light with respect to an observer on say, planet Earth, and you turned on your headlights, you would see your lights flash out into space at the speed of light as you expect.  The observer on Earth would see you reaching ever so slowly to flip the switch but would have to wait practically forever (depending on how close to the speed of light you were traveling) for you to actually get to the switch to turn them on, so you'd zip right past him, he'd die, and humanity would cease to exist before the light from your ship even made it to the planet.

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Re: Speed of light question.. [Re: tripp23]
    #9301988 -

Short answer: the light travels at the speed of light. So you might think that you would see the light moving really slowly away from you, since you're almost at the speed of light too. But time slows down for you, so it appears normal.

The reason: you cannot tell if you are moving without looking outside. This is Newton's Principle of Relativity.


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I know... that just the smallest
                                                part of the world belongs to me
You know... I'm not a blind man
                                                    but truth is the hardest thing to see

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Re: Speed of light question.. [Re: zouden]
    #9302085 -

if one could reach the speed of light i think things would start to explode... more like de-exist.


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the pillars of the universe are taking a break at the moment, please call again

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Re: Speed of light question.. [Re: Big_Whoop]
    #9302092 -

> if one could reach the speed of light

One cannot reach the speed of light, thus any guesses as to what would follow are pointless.  You cannot take the square root of a negative number, thus if you have rest mass, you cannot reach the speed of light.  You can get very, very close, but never equal.


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Just another spore in the wind.

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Re: Speed of light question.. [Re: zouden]
    #9303078 -

zouden said:
This is Newton's Principle of Relativity.


You mean Einstein's?


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Re: Speed of light question.. [Re: Seuss]
    #9303141 -

Or in this case, where v=c, you get a singularity which is even worse than an imaginary number.

zouden said:
The reason: you cannot tell if you are moving without looking outside. This is Newton's Principle of Relativity.


Close :tongue: You're probably thinking Galileo.

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Re: Speed of light question.. [Re: DieCommie]
    #9304056 -

not sure what the other posts saidbut everything is relative. we as a galaxy are moving away from other galaxies faster then the speed of light. so we will never be able to "see" them,so i think it woudl appear normal to you, justnot to people outside.but then again speed of light probably adds ainteresting element


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And Moses Said "Let my mushrooms grow!"

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Re: Speed of light question.. [Re: the man]
    #9304065 -

the man said:
not sure what the other posts saidbut everything is relative.


The speed of light isnt.  :wink:

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Re: Speed of light question.. [Re: DieCommie]
    #9304081 -

This may not be correct after all.

http://www.newscientist.com/article/mg20026801.500-why-einstein-was-wrong-about-relativity.html?page=1

IMAGINE you are on a bicycle, pedalling across the cosmos. A beam of light - perhaps sent off by a distant collapsing star - zings past you. How fast are you and the light approaching each other? You are travelling at hardly any speed, so the answer will be more or less exactly light's speed through the interstellar vacuum, around 300 million metres a second.

Now imagine you abandon pedal power for the day. Bowling along in your spaceship at half light speed, you meet another light pulse head-on. What is your speed of approach now? Surely it is just your speed plus that of the light: in total, one and a half times light speed.

Wrong. Your speed of approach will be the speed of light, no more - and that's true however fast you are travelling. Welcome to the weird world of Einstein's special relativity, where as things move faster they shrink, and where time gets so distorted that even talking about events being simultaneous is pointless. That all follows, as Albert Einstein showed, from the fact that light always travels at the same speed, however you look at it.

Really? Mitchell Feigenbaum, a physicist at The Rockefeller University in New York, begs to differ. He's the latest and most prominent in a line of researchers insisting that Einstein's theory has nothing to do with light - whatever history and the textbooks might say. "Not only is it not necessary," he says, "but there's absolutely no room in the theory for it."
Not only is light not necessary in relativity - there's no room in the theory for it

What's more, Feigenbaum claims in a paper on the arXiv preprint server that has yet to be peer-reviewed, if only the father of relativity, Galileo Galilei, had known a little more modern mathematics back in the 17th century, he could have got as far as Einstein did (www.arxiv.org/abs/0806.1234). "Galileo's thoughts are almost 400 years old," he says. "But they're still extraordinarily potent. They're enough on their own to give Einstein's relativity, without any additional knowledge."

The claim has got other physicists thinking. Take Feigenbaum's argument a step further, some say, and we might long ago have seen our way not only to Einstein's relativity but also to the idea of an expanding universe - even one whose expansion is accelerating - without the intellectual upheavals that have led us to those conclusions today.

Article continues at the link.


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I keep it real because I think it is important that a highly esteemed individual such as myself keep it real lest they experience the dreaded spontaneous non-existance of no longer keeping it real. - Hagbard Celine

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Re: Speed of light question.. [Re: DieCommie]
    #9304083 -

im no expert, but how can we be moving faster then the speed of light as a whole galaxy and nothing strange happens??


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And Moses Said "Let my mushrooms grow!"

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Re: Speed of light question.. [Re: the man]
    #9304098 -

We aren't moving faster than the speed of light.


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I keep it real because I think it is important that a highly esteemed individual such as myself keep it real lest they experience the dreaded spontaneous non-existance of no longer keeping it real. - Hagbard Celine

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Re: Speed of light question.. [Re: HagbardCeline]
    #9304114 -

well what i was taught was that at the very start like 6000 ya  haha jk. there was 7? galaxies formed and they are all moving away at faster then the speed of light away from each other. because no information is passed B/w them it is possible. if i get some time ill look it up, pretty vague and prob not using the right words..

peace


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And Moses Said "Let my mushrooms grow!"

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Re: Speed of light question.. [Re: the man]
    #9304304 -

Yea, the universe is expanding faster than light but this doesnt violate relativity for the reason you say; no information can be passed.

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Re: Speed of light question.. [Re: Minstrel]
    #9304446 -

Minstrel said:
zouden said:
This is Newton's Principle of Relativity.


You mean Einstein's?


Nope, Newton's Galileo's (thanks DieCommie). The Principle of Relativity is one of the key assumptions for Einstein's Special Theory of Relativity.

Galileo said that you can't tell if you're moving without looking outside (frames of reference and all that). Someone else discovered that all waves move at a constant speed relative to their medium, and since light can travel through a vacuum, it means there's a maximum (constant) speed of light.

So, you have a frame of reference moving near the speed of light, and you shine a light forwards, or at a mirror, or whatever (there's all kinds of ways you can construct this). Einstein wondered how it is that light moves at a constant speed yet we cannot use it to tell if we're moving or not. The solution is time dilation.

Furthermore, if you construct your problem such that you can draw the light path relative to the observer moving near the speed of light, and another path relative to a stationary observer, you can get a triangle which represents (geometrically) the time dilation. Solve using Pythagoras' theorem and you can come up with Einstein's time dilation formula. If you attempt to solve this using other, known formula such as the one for (I think) kinetic energy, you end up with E=mc2.

It's been years since I learnt this so I'm expecting a few corrections :grin:


--------------------
I know... that just the smallest
                                                part of the world belongs to me
You know... I'm not a blind man
                                                    but truth is the hardest thing to see

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Re: Speed of light question.. [Re: the man]
    #9305561 -

the man said:
well what i was taught was that at the very start like 6000 ya  haha jk. there was 7? galaxies formed and they are all moving away at faster then the speed of light away from each other. because no information is passed B/w them it is possible. if i get some time ill look it up, pretty vague and prob not using the right words..

peace


there is a shitton more than 7 galaxies out there, but the fasted we could have expanded after the big bang would be the speed of light, but matter itself isn't supposed to be able to go that fast, so just a tiny bit slower than that.

peace

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Re: Speed of light question.. [Re: supra]
    #9305766 -

It gets complicated when talking about galaxies receding from us... but they can move away from us faster than light.  Consider this, the universe is 13 billion years old, so at the speed of light it would be 13 billion light years across, but it is much bigger than that implying that the universe expands faster than light.

This is because the space in between us and them is expanding.  So the further away a galaxy is the more space is between us and it, meaning it will move away from us faster (the speed it moves away is proportional to the distance from us).  There is a point where the galaxy is moving away faster than the speed of light.  Now this doesn't violate relativity because when it moves away from us faster than light, it disappears from our view (as 'the man' pointed out).  Remember that from relativity that we cannot communicate faster than light.  This is not violated by a galaxy receding from us faster than light.  This means that our galaxy and that distant galaxy each have our own isolated bubble of causality - we cannot affect or talk to them and vise versa.  Eventually, galaxies will recede from each other to the point where none will be visible our galaxy will appear to be the only one in existence.

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