Physics talk

[bogan]

Are we all in agreement on tyre deformation now?

Not only are we in agreement, we're learning

My theory, is your headlight turns on, but you don't see it (meh, closed road)

You're quite right, for you to see the light it must be reflected off something, and since you would arrive at that something at the same time as the light; the only seeing would be done by any bystander observing your fiery mess.

[bogan]

So if you turn your headlights on at the speed of light....they come on....duh? what did you expect would happen? lol

But how do you turn them on? Applying the theory you're using would mean time stops completely for the person traveling the speed of light, making it impossible for even an electronic circuit to turn on the light. Of course applying that same theory would mean light speed is not actually achievable, but I assumed you were ignoring that part of it?

[ducatilover]

nah, photons do this cool thing where no matter what speed you're traveling at, they travel at the speed of light.

So if you're standing still and a photon goes past you, it does so at 200,000km/s

If you're walking along a road, and a photon goes past, it does so at 200,000km/s relative to you.

If you're driving in a car at 200km/h a photon will, to you, be going 200,000km/s

If you're traveling at 200,000km/s a photon will accelerate away from you at 200,000km/s

So if you turn your headlights on at the speed of light....they come on....duh? what did you expect would happen? lol

Can I buy moar photons for my lights?
Wouldn't this mean a photon is capable of traveliing fater than light? and if so, can you show me

[Dave-]

But how do you turn them on? Applying the theory you're using would mean time stops completely for the person traveling the speed of light, making it impossible for even an electronic circuit to turn on the light. Of course applying that same theory would mean light speed is not actually achievable, but I assumed you were ignoring that part of it?

yeah there's a few flaws...

[Drew]

Yes bogan, but here all I was doing is providing a citation, I would have assumed you'd read the whole thread ok? I'm sorry I forgot to mention it the 2nd time.

Also sorry for being a dick.

I've just done 14 hours a day for 8 days straight.

The something does decrease the radius of the tyre, but this gets wiped out by god knows what other forces are flying around and fucking shit up, which is why guys like drew are so amazing cause they know the sum of the fuck ups.

Are we all in agreement on tyre deformation now?

The sum of the fuck ups is reasonable...The fuck ups are counter intuitive a lot of the time.

No body brought up that since it's spinning, doesn't the wheel create it's own gravitational 'pull'?

funny shit actually happens near the speed of light, not even kidding.

Who wants to know what happens when you turn your headlights on at the speed of light?

This is gonna get silly.

[Drew]

can you show me

No no no young bucky.

It has been mathmatically proven only. There's no way to display the results without propelling something to the speed of light, and then turn on the lights.

[schrodingers cat]

nah, photons do this cool thing where no matter what speed you're traveling at, they travel at the speed of light.

So if you're standing still and a photon goes past you, it does so at 200,000km/s

If you're walking along a road, and a photon goes past, it does so at 200,000km/s relative to you.

If you're driving in a car at 200km/h a photon will, to you, be going 200,000km/s

If you're traveling at 200,000km/s a photon will accelerate away from you at 200,000km/s

So if you turn your headlights on at the speed of light....they come on....duh? what did you expect would happen? lol

Proof please.

[oneofsix]

No no no young bucky.

It has been mathmatically proven only. There's no way to display the results without propelling something to the speed of light, and then turn on the lights.

Hold up. If a photon travels away from anything at the speed of light then if the light creating the photon is travelling at say quarter the speed of light then the photon emitted would have to be doing 1.25 times the speed of light and therefore it would/should be provable with the photon emitter travelling at less than the speed of light when you turn the lights on.

[Drew]

Hold up. If a photon travels away from anything at the speed of light then if the light creating the photon is travelling at say quarter the speed of light then the photon emitted would have to be doing 1.25 times the speed of light and therefore it would/should be provable with the photon emitter travelling at less than the speed of light when you turn the lights on.

I reckon they need to start at the speed of kight, because the one thing geeks agree on, is that funny stuff happens at the speed of light.

[Drew]

Hold up. If a photon travels away from anything at the speed of light then if the light creating the photon is travelling at say quarter the speed of light then the photon emitted would have to be doing 1.25 times the speed of light and therefore it would/should be provable with the photon emitter travelling at less than the speed of light when you turn the lights on.

Is the speed of light, a photon's terminal velocity though?

Just occured to me and it's too hard to edit posts from my phone.

[oneofsix]

I reckon they need to start at the speed of kight, because the one thing geeks agree on, is that funny stuff happens at the speed of light.

Sounds like a cop out. If they haven't proven that a photon starting from an emitter travelling at quarter the speed of light will exceed the speed of light then why give a monkeys about the funny stuff that happens at the speed of light. It could be that part of that funny stuff is that a proton gathers mass and can't exceed the speed of light so their maths is all just theory.

[MisterD]

Hold up. If a photon travels away from anything at the speed of light then if the light creating the photon is travelling at say quarter the speed of light then the photon emitted would have to be doing 1.25 times the speed of light and therefore it would/should be provable with the photon emitter travelling at less than the speed of light when you turn the lights on.

Nope. What you need to let go of, is that time is some kind of constant. It isn't and it varies depending on the observer.

This isn't just theoretical either, GPS satellites travel fast enough that compensation has to be built-in for relativistic effects...it's probably a good job they don't have tyres.

[pzkpfw]

Yep, been known for many many years now. (And shown by experiment).

The speed of light (in a vacuum) is a constant; and it's time and distance that bend to make it fit.

If I'm "still" and a ship passes at (what I consider) 0.5c, and the ship shines a light ahead; both I and the ships crew will measure that light as being at c.

What makes it "work" is that I and the ships' crew will measure time and distance differently.

It's hard to make our brains grok it, because we spend so little time at speeds near what we'd measure as close to the speed of light. (Yes, even those of you who own GSXR's).

[oneofsix]

Nope. What you need to let go of, is that time is some kind of constant. It isn't and it varies depending on the observer.

This isn't just theoretical either, GPS satellites travel fast enough that compensation has to be built-in for relativistic effects...it's probably a good job they don't have tyres.

Good point. I was thinking speed but of course speed is distance over time.

OK ok pzkpfw no need to run it in, its a great commuter and fast enough for ticket collecting if not for light bending.

[bogan]

Yep, been known for many many years now. (And shown by experiment).

The speed of light (in a vacuum) is a constant; and it's time and distance that bend to make it fit.

If I'm "still" and a ship passes at (what I consider) 0.5c, and the ship shines a light ahead; both I and the ships crew will measure that light as being at c.

What makes it "work" is that I and the ships' crew will measure time and distance differently.

It's hard to make our brains grok it, because we spend so little time at speeds near what we'd measure as close to the speed of light. (Yes, even those of you who own GSXR's).

and distance? I thought it was only subjective time that changed, or do you mean the ship stretches out as it approaches light speed?