Speed of light

If my car was going at the speed of light, what colour would my headlights be?

nonzero rest mass -> cannot travel at c

an interesting thought expariment, even though impossible.  I think I will humor this for now. 
first thing's first, since this is impossible from the get-go, there are no wrong answers.
that said, I think that your headlights would create matter.  technichally, you would create a light beam with a wavlength of 0, or a frequency of infinity, so in essence, you would just create energy in a certain place in space.  doing this, you would raise the energy of that space until matter (frozen energy, by reletivity) spontainiously was created in that region.

>>3
light travels at speed c in all inertial reference frames, buddy. you would see the light leave your headlights at speed c.

This is not negotiable, it's one of the main premises of relativity.

Light speed is C, because of your slick CFLAGS

>>1
Any answe to that question is boring. The interestinh question is where would you be if you (the person in the car) turn of the car after any period of time.

>>6
thats a less interesting question.

on another note, how do black holes "stop" light. as in, light can't be going slower within a black hole, so does it simply curve space so much so that light just curves around back into the singularity?

light is affected by gravity.
black holes have hueg gravity.

thers an explanation of why stuff cant get out of black holes that doesnt mention escape velocity, which makes it a lot more understandable for why light stays in, but i dont recall this argument at the moment.  perhaps someone else knows what im talking of.

The time of a traveler at speed of light
ct'= (ct - xv/c)/sqrt(1 - v^2/c^2)
has actualy stopped, if you (standing at still or at a velocity less than c) would see >>1 's clock, it would never move forward. Therefore, how would he see his headlights while traveling at c? He could not. Because while traveling at c your time has stopped, so you can't see shit until you slow down.
>>6
The same instant where you reach speed of ligth (from the traveler's point of view) you would crash in a planet/star, jump outside the universe or fly forever.

so you can't see shit until you slow down.
Actually, from the traveller's viewpoint, the slowdown would be immediate. (If it were possible to travel at c in the first place.)

>>11

Semantics.

>>1
Time paradox.

If you travel at the speed of light time in the universe accelerates to infinite and you don't see a thing.

VROOM VROOOM

Traveling at the speed of light is dividing by 0

>>16
Totally possible, then

reletivety therory ppl, know more

>>16
Dude, I traveled at the speed of light OH SHI-

>>16
nullity!

>>10
>Because while traveling at c your time has stopped, so you can't see shit until you slow down.

You're an idiot. Time for the traveler stops only in the observer's eyes. The traveler always sees his own natural time. Everyone does.

>jump outside the universe

Funny how I don't see photons doing this very often.

>>21
>The traveler always sees his own natural time.

This is true for any speed less than exactly the speed of light.
Because it does not hurt me exercise my english a little bit, I will explain it to you.

Fact n1: the speed of light is the same for everyone.
Fact n2: there is no experiment that you can do on a non-accelerating spaceship that will prove that you're moving (the thing that moves by outside the window could be moving and you're the one that is standing still).

Imagine a photon based clock, two mirrors amidst which a photon jumps up and down. If the mirrors are distant 1 meter then 150 milion jumps (up+down) equals 1 second. So when you're standing still the outside observer sees that the photon needs 1/150000000 of a second for a jump. But if you move the photon will travel diagonally for the outer observer, this means the photon has traveled a longer distance. That means it has spent more time (the observer's one) to do one second (the spaceship's).

I think you knew all that, now imagine that same clock on a spaceship traveling at the speed of light. If the photon would try to travel diagonally (jumping up and down for the ones on the spaceship) it would stay behind the mirrors, which would be against the fact n2 (dunno how it's actualy called :/). Therefore the personal time of the spaceship is not moving. The ones on it would not move in time until the spaceship would slow down.

t(personal) = t(observers's)*sqrt(1 - v^2/c^2)
if v=c
t(p) = t(o)*sqrt(1 - c^2/c^2)
t(p) = t(o)*sqrt(1 - 1)
t(p) = t(o)*sqrt(0)
t(p) = t(o)*0
t(p) = 0

>jump outside the universe

>Funny how I don't see photons doing this very often.

You got me there. Sorry for the mistake. :P

how does something slow down when it doesnt experience time omgz.

>>23
Someone else stops it.

>>23
Installing Windows Vista

time paradox

(possibly related to the inability to travel at the speed of light in the first place)

>>1
>>2
thread over

>>8
Yep.

ok, what if the car approached the speed of light, say, managed to get to 99.9% the speed of light, then its mass would be huge right?  so would the light still be able to get out of the headlights, or would it just curve around the car.  assuming the car didnt collapse on itself

Dennis Ritchie is the father of the speed of light.

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