Linked Questions

4
votes
4answers
11k views

Breaking the speed of light relative to a moving object [duplicate]

You can't go faster than light, and light can't be additive (if you shine a light from a spaceship, the light is not going $c$+"speed of spaceship", it's just going like it always does). But what ...
4
votes
2answers
10k views

What is the relative speed of two near-light speed particles headed towards each other? [duplicate]

I understand that nothing can move faster than light due to time dilation. I want to build upon my understanding of Einstein's theory of Special Relativity, so I came up with this hypothetical problem ...
1
vote
3answers
495 views

Stuff can't go at the speed of light - in relation to what? [duplicate]

We all know that stuff can't go faster than the speed of light - it's length becomes negative and all kinds of weird stuff happens. However, this is in relation to what? If two objects, each moving ...
2
votes
2answers
591 views

Speed of light paradox [duplicate]

If I send two rockets from the Earth in opposite directions, at, say, 60% of the speed of light relative to the Earth, then relative to each other they are travelling at 120% of the speed of light. ...
-2
votes
1answer
527 views

Something almost faster than light traveling on something else almost faster than light [duplicate]

Possible Duplicate: Travelling faster than the speed of light Double light speed Lets say that an airplane can fly at 4/5 of the speed of light, and I can run at 2/5 of the speed of light, and ...
1
vote
2answers
368 views

Relativity and speed of light again - two opposite light sources [duplicate]

Two light sources emit light at the same moment but in opposite directions. At what speed the distance between two light fronts is increasing? c or c * 2? Note, that there is only one coordinate ...
-1
votes
1answer
204 views

Driving car with (almost) the speed of the light and switch the headlights on [duplicate]

I'm curious what will happen if we 'drive' a car with (almost) the speed of light, and all of sudden we switch the car headlights on? Will the car headlights ray have double speed (speed of 600.000km/...
0
votes
1answer
200 views

Relative speed when approaching the speed of light [duplicate]

According to this chart of the Lorentz factor as a function of speed: If a spacecraft neared (roughly) 0.85c, would it appear to be traveling at 1.7x the speed of light from the perspective of those ...
0
votes
3answers
157 views

Can relative speeds be greater than the speed of light? [duplicate]

I am trying to wrap my mind around special relativity and I have these questions: If I am moving at 70% of the speed of light (relative to the ground) to the right, and my friend moves at 70% of the ...
-4
votes
3answers
352 views

Speed of light and headlight [duplicate]

What will happen if you drive a car at the speed of light and keep headlights on? Will it be behind the car or just work like normal?
2
votes
0answers
186 views

Reaching the speed of light, rockets [duplicate]

Possible Duplicate: Double light speed Someting almost faster than light traveling on something else almost faster than light Well I've been wondering quite a long time about this problem. If ...
2
votes
1answer
79 views

Can relative velocity of a particle exceed the speed of light? [duplicate]

Consider two particles (having same mass) moving with constant velocity very close to speed of light, say $0.99c$ in opposite directions. Will the magnitude of their relative velocities exceed the ...
-1
votes
1answer
60 views

what does it truly mean for there to be a max speed? [duplicate]

Firstly, I apologize if this is the wrong place to post this question; I'm not a scientist, just curious. So: if the speed of light (299 792 458 m/s according to Google) is an absolute limit even for ...
1
vote
1answer
52 views

Speed of Light and Relative Velocity [duplicate]

Yesterday I was going through the idea of Relative Velocity in which, when the bodies are moving in opposite directions, their velocities add up. So, if one of the bodies in consideration is light, ...
0
votes
1answer
51 views

Speed of light limitations [duplicate]

In any circular cyclotron, how can the proton projectiles approach each other at more than 50% of the speed of light without exceeding the speed of light relative to each other?

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