If you were driving at the speed of light and turned on your headlights, would they work? what about the horn?
535712
Sure they would work, just not shine ahead of you.  The horn would be fun, the people behind you would wonder who was honking at them.  What kind of car you got?
296770
i suppose it depends on the car.  there are a few cars that are jet powered that can travel faster than the speed of sound.
688056
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 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 no, it won't do a damn bit o 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.
1076587
it depends how fast u go. lol
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
905659
It depends on the horn's condition this might give you a start off point\n\nhttp://rds.yahoo.com/_ylt=A0geusTgVV9FdEsAN1lXNyoA;_ylu=X3oDMTE3cDl1dGNiBGNvbG8DZQRsA1dTMQRwb3MDMQRzZWMDc3IEdnRpZANPT1A1XzEyMQ--/SIG=11etr9o80/EXP=1163962208/**http%3a//www.howarth.uk.com/
1116675
Ha\n\nInteresting speculation \n\n1. The light will not change color no matter how fast you go. Only in your perception it will, so unless the law enforcement is traveling within your frame of reference you would be found guilty anyway.\n2. True, if you are moving towards the light its frequency will increase towards the blue and will appear green to you, but the acceleration would kill you.  \n3. If you could travel with speed of light why would you care about traffic lights?\n\nGood question anyway.
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!
361230
In this imaginary situation, you will still see your headlights working the same way as they normally do. Without going into tricky mathematics, just recall the fundamental postulate of special relativity: \nThe speed of light is CONSTANT in all inertial frames of references (considering the same medium). \nSo, the speed of light will still be the same in the frame of reference attached to your vehical, which is an inertial frame, because it is moving with the (uniform) speed of light!
60189
I would not recommend driving at the speed of light.  There is a very good chance that you will get pulled over by the cops, and unless you have a very good excuse, the will most definitely give you a speeding ticket.  Since, in most states, the amount of the fine is directly related to the speed you are traveling, most of the money you earn for the rest of your life will be going to paying off the fine.
774710
wouldn't they be white? the same as they always are. can a car even move at the speed of light?    OOHHH wait would you even see the light if you turned them on and you were running faster than them so you past them and they were behind you or something like that.
79821
Simple answer is NOTHING.  This is the explaination:  When you are traveling in a car at 70 MPH and there is a bug flying around in the car (say 0.5MPH), the bug is also traveling at 70 MPH ().5MPH can be ignored as bug is flying around in the car with null effect on the speed).  This is the part of theory of relativity.  Now let's see our car is traveling at the sped of light, when you turn the light on, the rays are traveling at the same spped and you see no effect of light (i.e. still dark-if driving at night).  If you just slow down at little (say 5%) then you will see light just ahead of the car and same applies as if you spped up the car slightly, it will be still dar and you may see back of the car lit (light left behind) for having lheadights in the front.
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.
1042298
No it can't.\n\nLaser light goes at exactly the speed of light.
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.
1128096
If you want an answer based on the known theories or experiments... they all will fail on the very assumption of something moving at speed greater than speed of light.\n\nBut in principle.... if something like that can be done.. it would be possible if not clearly see.. but record such events.\n\nMicrowave Background Radiation (if you have ever heard off) are the signatures of what must have happened at time of birth of universe i.e. just after big bang.
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.