consider if v r travelling in a vehicle at the speed of light, wat ll happen when we switch on the head light.
89599
<You wouldn't see any light if you were traveling at the speed of light when you turned them on,but if you turned the lights on before you took off the light would stay in front of you.
214563
The previous answer is wrong. There is absolutely nothing stopping your reference frame travelling near (or even at) the speed of light. Even if you were travelling at 0.999999% the speed of light, you would still observe a light beam travelling past you at c. This speed is a constant because the speed of light does not depend on the velocity of the object emitting the radiation (see Maxwells equations).
997335
Well, I guess you must be made of massless particals, since they are the only thing that can travel at the speed of light. And I guess by asking "What would I see?" would suggest that you have an ability to "see" by interacting with outher light. Stated that way I think you would have good question.\n\nWell, do to time dialation, you would travel the width of the universe with out any change in time. Basicly, you clock would stop.\n\nThat aside, you would find out that light still passes you at the speed of light. So, if your head lights shine on an object and it is reflected back , you could see it. However, the light is now different. You would find that the light has more energy a lot more energy. How much i'm not sure. In other words the light would have changed color from say visible light to powerful gamma rays. \n\nSo, your question is a good one but the answers are wierd. But I think that's what the general theory of Relativity says.\n\nIf you do the math you would find that at low speeds add just as we expect. That is, an object is traveling at v1 and is passed by an other object at V2 the the speed is simply the sum of the two.\n\nHowever, as we approach the speed of light, "c" and the math becomes odd. If a photon of ligh is passed by an other the speed to an outside observer is both are traveling at "c." \n\nThis odd situation is resolved by how time is measured by the travelers. In this case, no time passes for either traveler. And now it doesn't make since to say who passes who if no time passes. Sort of like trying to divide by zero. It makes no since to common sense.
966236
No matter how fast you go or think you are going, light always appears to be going the speed of light.\n\nEven if you are going 0.99999999999 c from the viewpoint of an outside observer, you would still see light traveling at the speed of light around you. Now, light sent by objects moving at 0.9999999999 c towards you (those "ahead" of you) would be severely blue-shifted and light from objects moving away from you at that speed (those "behind" you) would be severely red-shifted.\n\nBut light from any object moving the same speed as you would look perfectly normal. In fact if you covered the windows of your spaceship (it better be a spaceship, since you won't be in any atmosphere for very long), you wouldn't know you were moving at all!
236873
According to Einsteinian theory, yes, you would see the light.  Einstein postulates that the speed of light is relative to the viewer.  If you were travelling at the speed of light and turned on a flashlight, the light traveling out of the flash light would be traveling away from you at the speed of light relative to you.
265157
It takes an infinite amount of energy to reach the speed of light, so the quick answer is "You can't".\n\nIf you are traveling at CLOSE TO the speed of light and you turn on your lights they will appear (to you) to create cones of light that travel at light speed relative to you.  If you measure the speed of the light, you will get c (approx 300,000 k/sec).  To you, the light will appear to be traveling 300,000 k/sec faster than you are.\n\nAn observer who is not moving (one who see's you as traveing at nearly light speed) will also see the light as traveling at speed c, but he will see it as moving only a little faster than you are.\n\nHow can this be?  It happens because of something called "time dialation/compression" (see the Theory of Special Relativity).  The "seconds" measured by you (in the car) are MUCH longer than the seconds measured by the motionless observer.  That's the magic of special relativity.\n\nThis is confusing stuff.  If you want to really understand it, look up special relativity and read carefully.
1130810
Light travelles at a constant speed in a vacume Therefor no acceleration" But Light has to get to this speed so what is the inital acceleration of light
641394
As weird as it sounds, the theory of relativity says that if you are in a car traveling at 200,000,000 m/s with the headlights on, then the light from those headlights will pass a person standing still at 299,792,458 m/s and not 499,792,458 m/s. And if that stationary person shines a light at your car, you will see his light approaching you at 299,792,458 m/s and not 499,792,458 m/s.\n\nThe theory is so weird that numerous scientists have done numerous experiments to test it. The most famous of these experiments is the Michelson-Morley Experiment. All experiments have confirmed that this strange prediction of relativity is true.\n\nBelieve it or not!
228021
Some people would argue the logic of a space craft having headlights at all, others might find fault in the fact that, physically, nothing with mass can ever travel at the speed of light.  But lets put that aside.\n\nThe speed of light is constant in any frame of reference, no matter who is "watching" it, it always travels with respect to them at the speed of light (c).\n\nIf you are in a space ship already traveling at the speed of light [with respect to some outside observer], when you turn on the headlights, the light will move away from you at the speed of light.\nIf some outside observer (who you are flying past at the speed of light) watches all this, they would, too, see the light travel at c with respect to them.  But since you and the light are traveling both at the speed of light with respect to the observer, you and the light would be keeping up with eachother.
64267
Well, if you're traveling faster than light, then the light can never be in front of you.  There would be just a big nothing, probably drive you crazy if you looked at it.  I know, I come from andromeda.  We travel through space backwards so we can see where we're going.
1081392
This question comes up very regularly. If you do a search you will find it has been answered dozens of times in the past few months.\n\nThe thing you need to relaise is that the speed of light is an absolute constant. It doesn't matter what speed you are travelling at, the light will always be travelling away from you at the same speed: the speed of light.\n\nThe freaky part is that the light from your headlights would seem to be travelling away form you at the speed of light (C), but to an observer who was sitting still the light would also appears to be travelling away from them at the speed of light. How can that happen? Well it's one of the tricky bits of relativity, but part of the solution lies in understanding that although light never slows down or speeds up relative to any observer it does change frequency.\n\nSo to you the light from your headlights will look quite normal, but to someone sitting still your headlights will appear to be emitting x-rays. The light would be invisible to them.\n\nThe corrolary of that is that any light approaching your windshield will be equally shifted into the x-ray part of the spectrum. Although the headlights will be emitting visible light, any time they strike an object and reflect back they will reflect back extremely low frequency light that is invisible to the human eye.\n\n\nSo yes, you most ceratinly would need headlights if a car is travelling at the speed of light. Unfortunately it won't do a damn bit of good to turn on your headlights. That's not because the light won't travel, it will travel just fine. The problem will be that any light that reflects back off the road will be invisible to the human eye.
193299
It would take infinite energy to accelerate you and your light fixture to the exact speed of light which would thus be impossible.  However, as you approach the speed of light, at ever greater fuel expenditure, your rocket ship would shrink in the direction of travel and you would become a "pancake" but not be aware of it.  When you turn on your light, the photons emitted straight ahead would travel at the speed of light, c.  Photons always travel at the speed of light in a vacuum.  it is not like shooting bullets ahead from a fighter plane where muzzle velocity is added to the speed of the plane.  Although Einstein's theories of relativity do apply to the plane and bullets as well as photons, the effects are almost undetectable at the very low velocities we ordinarily experience on earth.
133450
well, the usual rules of physics at such speed don't apply. so when you turn the headlights, the light will travel from them at approximately the usual speen of light, and i guess you won't notice anything unusual..\nfor more information check the subject at wikipedia. and the following subject: Constant velocity from all reference frames
992432
Your question is similar to Einstein's question that led to a revolution in physics, so it's not a stupid question by far. Einstein asked, what would happen if someone could travel along a beam of light? What would the traveler see? \n\nThink of relative motion. When I'm on a train, watching the country side go by, it appears to me that everything else is moving and I, the tables, the chairs, and the people on the train are not moving. If I were standing on the ground watching the train go by, it would be the oppisote: I would appear, to myself, to be standing still, and the train, people on it, chairs and tables would all appear to be moving. Relative motion, hense the term "relativity."\n\nWhat Einstein discovered is that even if one could travel at the speed of light, that person would observe the light in your headlight traveling away from him AT THE SPEED OF LIGHT. Weird, huh? Think about it. If you're on a ski slope and an avalance is chasing you, what are you going to do? You are going to RUN. Why? It decreases the rate at which the avalance is approaching you. If the avalance is traveling 20  mph and you can run 15 mph, the avalance is only gaining on you at a rate of 20 mph - 15 mph = 5 mph. You slow it's approach to you. However, that does not work with light. If you ran away from a light beam, and managed to travel at the speed of light, the light beam behind you would STILL BE APPROACHING YOU AT THE SPEED OF LIGHT. Light speed is constant in every reference frame, no matter WHAT the speed of the observer. \n\nIn short, you would see the light in the headlight traveling away from you at the speed of light.
1075094
Of course they'll work. The question is if you will see them. You can't travel at the speed of light, anyway, or physics is wrong, so nobody would be able to give you an answer. \n\nAssuming you were just really close to the speed of light, you would still see them. Einstein discovered that the speed of light in a vacuum is constant to ALL observers, no matter how fast the source of light is going relative to the observer. So at any speed, you can see your headlights just fine.
293728
At the speed of light you gain infinite mass so the light beam from a headlight must go faster than light to escape the headlight it's self.If the beam could be a higher energy of light like gamma rays and if you could see a gamma ray which human eyes can't then maybe you'd see something. The question is will they come on,yes because\nthe electricity will flow through the filament of the bulb so it's on but can you tell by eye?No,because it would take forever for the light to reach your eye at equal speeds.
712928
if a cow laughs does milk come out of its nose     or what if traveling  at the speed of light will your headlights work