if u r travelling at speed of light in a car with mirror attached in front of u.can u see the back of the car?
109643
No you can not.\nNothing can travel faster than light. Not even light itself.\n\nIf you think that light is a wave (like a wave on the ocean) Imagine that you were riding one wave and were trying to make a new wave from your position (with equal frequenzy ofcours). The new wave would not have twize the speed as the one you were riding, it would have the same speed as the one you ride (try in the bathroom and you will see).\n\nMy point with this explanation is that the light from the back of your car will never reatch the mirror. I think your mirror would seem black, because no light would reatch it. The lightwave from the back of your car would be "flying" towards the mirror in the same speed that the mirror would fly from it. :)
160198
This is a very interesting question and most people don't understand it.\nTHE value of the speed of light  is "C" in vaccuum IRRESPECTIVE of the refernce frame. Light will travel at velocity C (relative to you) even if you are going at C. \n\nSounds crazy? This is at the fundamental of Einstien's assumption which was later proved right. Common sense is often wrong.
303634
no the beams of light would bend back over the windshield of the car
338111
On the image. The light works exactly as it would if the object was actually behind the mirror at the distance it appears to be.
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).
328292
Yes, the radio is also going to be traveling at the speed of sound because it is in the car or whatever you are in. Therefore the radio is stationary relative to you, so it makes no difference how fast you are going. If you were going away from the radio you would not be able to hear it.
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.
429293
This is a frame of reference question.  To someone sitting in the car, the head lights would come on just like they always would, because the car is sitting still for that person.\n\nFor a person sitting on earth watching the car go by at the speed of light, they would not see the headlights come on.  This assumes a massless car, since no car with mass could go the speed of light, but I digress.\n\nI bet a massless car could get really good gas mileage.
592518
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\nIgnore what the previous poster said, he is completely incorrect. 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 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.
163148
Nothing happens, the car lights will travel at the speed of light in comparasion to the car. This doesn`t mean that the lights will travel twice as fast, you cannot add this velocities without taking into account Lorentz equations.\n\nIs it deja-vou or is it the third time this question has been asked?
113625
The car, you, and the headlights would no longer exist.  Light would continue at its usual speed.
1118162
If we imagine this all happening on in 1 dimension, a line, (i.e. no up/down or side to side movement possible), then the only way something can travel is toward or away from the observer.\nEven if this is not the exact case as in your example, this effect is easily done by merely turning one's head in order to align one's reference frame to the direction of the car's motion and thus would have the same effect.\n\nIn this case, our observer sitting at some location on the line and in his reference frame, everything else is moving either toward him or away from around him.\nIn his reference frame, he sees a car heading Straight towards him at relativistic speeds in the opposite direction he is facing.\n\nA length contraction occurs only in the direction of motion as observed by the observer.  In other words, if the car is moving toward/away from the observer, the car's length shortens, not its width or height.\nThe length contraction is in the same direction as the relativistic motion.  Since we defined this to be a single dimensional system with only one direction of travel possible, the approaching car would not get thinner or shorter (less tall), but rather, its length would contract.\n\nThe effects of the car appearing wider and taller as it got closer and closer would still apply as normal since the car is not traveling in either of those directions.\n\n\nIn your own frame of reference, taking a measurement and finding that the car has experienced a length contracting still makes that measurement every bit as real and valid as a measurement taken from the other car's frame of reference (v = 0) where there is no length contraction.
675938
The speed that the reflection is moving at is near light speed (186,000 miles a second). The spot we see the reflected light coming from is different as the plane moves across the earth, regardless of how fast or slow the plane is moving.
8700
no. well, its absolutely impossible to travel at the speed of light, but lets pretend you can so i can actually give you an answer to the question. The speed of light is actually the ultimate speed limit to the universe, nothing can travel faster than light, so although you would expect the light to be going at twice the speed of light (you plus the speed of light)it can't because it is physically impossible for even light to travel faster than the speed of light so it would be going at the same speed of you and not reach any path in front of you.  Of course, if you turned on your headlights before you started moving, the light would always be one step ahead of you.\n\nbut again, this situation couldn't happen anyway since you can't get to the speed of light, and if you want to know why, look at some of my answers to other questions about time travel (which involves velocity distorting time) and shining flashlights and such.
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.
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.
600967
No there is no 'summation' of speeds involved with light.  Light is Electro-Magnetic Energy, although light travels as particles as well as waves.  In this Universe the speed of light is a constant, roughly 186,000 miles-per-second, or 300,000 km/sec or 300 Mega-Metres / sec.  Unless some POWERFUL external force acts upon light, it cannot change speed.  This entails the gravity of black-holes and such. (Not even light can escape from them.)\n\nA vehicle might weigh somewhere in the neighbor-hood of 3,300 lbs. (Approximately 1,500 Kg, for those of you who have not learned to count properly, just yet ...)\nCheck out da' math ...\n\n60mph = 100 kmph = 27.77r mps. \n(1,500 Kg x 27.77r mps) / 9.81 mps = ~ 4,246 N\n\nI doubt, very seriously, that a little over 4,000 Newtons is enough force to even put a dent in the factor of light-speed.  For more info, look-up Einstein's Theory of Realtivity' (Although I believe 90% of it to be short-sighted ancient crap ...)  This subject is covered in it ...\n(umm covered in Einstein's Theory, not copvered in crap .. which err .. is the same thing at times ...