Light's Speed & Moving Observer: What Happens?

[danielhaish]

for example the car headlight would look faster then c speed. (it speed would be the speed of light +the speed of the car) to observer in front the car.
because the light come from the car so the speed of the car would connect with light speed (like when you walk on a train) .
so does the light wave go slower then the c speed in that case? when the source of light is moving .

 

[hutchphd]

Pleas reformulate these as rational thought. Faster than what? slower than what?

 

[danielhaish]

Pleas reformulate these as rational thought. Faster than what? slower than what?

is it batter now?

 

[Vanadium 50]

Not really.

 

[danielhaish]

Not really.

I edit it again

 

[Nugatory]

for example the car headlight would look faster then the speed of light (the speed of light +the speed of the car) to observer in front the car.
because the light come from the car so the speed of the car would connect with light speed (like when you walk on a train) .

Walking on a train doesn't work the way you are thinking. The train is moving at 50 km/hr, you're walking up the aisle at a speed of 5 km/hr relative to the train, you are NOT moving at 55 km/hr relatove to an observer on the ground.

Search this forum and google for "relativistic velocity addition"

 

[danielhaish]

Walking on a train doesn't work the way you are thinking. The train is moving at 50 km/hr, you're walking up the aisle at a speed of 5 km/hr relative to the train, you are NOT moving at 55 km/hr relatove to an observer on the ground.

Search this forum and google for "relativistic velocity addition"

I know so I am asking weather the speed of light connect with the speed of the car relative to observer on the ground? because as you said your speed and the train speed connect relative to observer on the ground

 

[PeroK]

I know so I am asking weather the speed of light connect with the speed of the car relative to observer on the ground? because as you said your speed and the train speed connect relative to observer on the ground

The speed of light, by the postulates of SR and as confirmed by experiment, is $c$ in both the ground frame and the car frame of reference.

 

[danielhaish]

The speed of light, by the postulates of SR and as confirmed by experiment, is $c$ in both the ground frame and the car frame of reference.

but what would happen to get this if the time on the car would go slower it wouldn't mind to outside observer it will steal experience that the light is going faster

 

[PeroK]

but what would happen to get this if the time on the car would go slower it wouldn't mind to outside observer it will steal experience that the light is going faster

Something is lost in translation there.

If you want to understand how the special theory of relativity supports the invariance of of the speed of light then you need to study material on SR (special relativity).

 

[hutchphd]

Einstein worked this all out. If you are interested in learning about Special Relativity, please get a book and put in the effort.

 

[danielhaish]

Something is lost in translation there.

If you want to understand how the special theory of relativity supports the invariance of of the speed of light then you need to study material on SR (special relativity).

I understand that if observer moves then it experience light slower but what if the light is coming from moving source how would it stay in the same speed relative to not moving observer

 

[PeroK]

I understand that if observer moves then it experience time slower but what if the time is coming from moving source how would it stay in the same speed relative to not moving observer

Where are you learning SR? Your statements don't make much sense.

 

[hutchphd]

Times, distances, and therefore clock synchrony all depend upon frame of reference. You will not figure this out by asking a series of disjoint questions. It is a comprehensive theory and you need to take the time to study it comprehensively.

 

[danielhaish]

Where are you learning SR? Your statements don't make much sense.

I saw it on youtube video . and sorry meant to type if the light coming from moving source . but imagine that a star is going a way from us how can the light coming from stay in the same speed relative to us

 

[PeterDonis]

I saw it on youtube video

You should not be trying to learn physics from pop science sources. You should be learning it from a textbook. Taylor & Wheeler's Spacetime Physics is a good textbook for SR.

imagine that a star is going a way from us how can the light coming from stay in the same speed relative to us

Because velocities in relativity don't add linearly. You have already been told to look up "relativistic velocity addition". All textbooks on SR discuss it.

 

[Vanadium 50]

@danielhaish , we try to be understanding of people whose first language is not English. But we are in a situation where we don't understand your questions and you don't understand our answers. And that's not helping anyone.

The suggestion to get a text is a good one, and I would amend that to "a text in your native language".

 

[danielhaish]

I think I found answer that connected to doppler low but I am not sure

 

[Sagittarius A-Star]

for example the car headlight would look faster then c speed. (it speed would be the speed of light +the speed of the car) to observer in front the car.

No. You are using here the classical velocity addition $u=u'+v$. Instead, you must use the relativistic formula:
$u = \frac{u' + v}{1+ u'v/c²}$

If you set $u' := c$, what is the result for $u$ ?

Source (see "Eq. 10"):
https://en.wikipedia.org/wiki/Special_relativity#Lorentz_transformation_of_velocities

P.S.
The same is valid for your thread from March.

 

[PeterDonis]

I think I found answer that connected to doppler low but I am not sure

The relativistic Doppler effect tells how the frequency and wavelength of light depend on the source's motion relative to the observer. The relativistic Doppler effect formula assumes that the speed of light is $c$ regardless of the source's motion relative to the observer.

 

[MikeeMiracle]

To summarize in simple terms:

It does not matter if whatever created that light is moving away from you
It does not matter if whatever created that light is moving towards you
It does not matter the speed at which whatever created that light is moving

The speed of light is always C in ALL directions!

For example: If you had 2 spaceships that travel at 0.6C moving in opposite directions from each other and one emits a beam of light, that beam of light will still get to ther other ship as it's still moving faster than the ship going in the opposite direction.