In any case, speedos don't measure velocity.

Sayonara³ said in post # :

In any case, speedos don't measure velocity.

 

Most of them approximate velocity from other measurements rather than speed, though.

Sayonara³ said in post # :

In any case, speedos don't measure velocity.

 

And AW and TSA still aren't working

true, probably a bad example then.

 

it just seems to all run a little contrary to things you consider to be perfectly sensible.

YT2095 said in post # :

it just seems to all run a little contrary to things you consider to be perfectly sensible.

 

People didn't think the earth being a spheroid was sensible either.

MrL_JaKiri said in post # :

Most of them approximate velocity from other measurements rather than speed, though.

Let's not overcomplicate it that far

 

MrL_JaKiri said in post # :

And AW and TSA still aren't working

Gavin's on it.

Sayonara³ said in post # :

Gavin's on it.

 

Why not just buy him a chair?

Servers are a lot warmer.

Sayonara³ said in post # :

Servers are a lot warmer.

 

My cat likes to sit on my underwear.

Filthy filthy MrL.

 

/me calls RSPCA

Sayonara³ said in post # :

Filthy filthy MrL.

 

/me calls RSPCA

 

It's not a filthy cat, I sometimes find it sleeping in the bath.

Is that where you keep your undies?

 

Sorry I thought you meant you were wearing them at the time.

Does light have totally different properties from everything else in the universe? One of thoses things that I'll never inderstand, seems like.

Very interesting.

So light beam A and B are heading in opposite directions. They are only going *c, then isn't it going half of c relative to the planet?

 

*(I think I've learned that c represents the speed of light from other's post, tell me if I'm wong)

-Demosthenes- said in post # :

So light beam A and B are heading in opposite directions. They are only going *c, then isn't it going half of c relative to the planet?

 

*(I think I've learned that c represents the speed of light from other's post, tell me if I'm wong)

 

c = 299792458ms^-1, the speed of light in a vacuum.

 

And NO THEY'RE NOT ONLY GOING HALF c

 

I gave you the sodding equation TWICE, USE IT.

-Demosthenes- said in post # :

Does light have totally different properties from everything else in the universe? One of thoses things that I'll never inderstand, seems like.

Very interesting.

 

No, it doesn't. It's pretty normal for a boson.

Like he said, they're always going c, no matter where you are, how fast your moving.

if we forget the flashlights for a second, it`s the 100 mph parts that throws me?

 

"They're actually seperating at 99.999999999998887mph."

 

surely 100 mph is just that? as in if both cars travel for 1 hour, they will be 100 miles appart.

If you are dealing with speeds approaching c, the difference is a lot more than 0.000000000001 miles.

 

I think that was the point.

well ok, so these 2 cars would be somewhat less than 100miles apart? or they would be 100 miles apart but get there at a slower speed, or time would say one hour was up to the driver when infact it fell short of 1 hour? WHAT?

 

I`m at a loss here, and I know there`s others in the queue (sp?) eagerly awaiting a responce other than a formula, a plain english answer maybe applicable here (I could be wrong, but working exapmples seem to get the point across a triffle better than a+bXz^c/a million+3.14 etc...)

 

It looks right! I just don't see what MRL is saying.

YT2095 said in post # :

well ok, so these 2 cars would be somewhat less than 100miles apart? or they would be 100 miles apart but get there at a slower speed, or time would say one hour was up to the driver when infact it fell short of 1 hour? WHAT?

 

I`m at a loss here, and I know there`s others in the queue (sp?) eagerly awaiting a responce other than a formula, a plain english answer maybe applicable here (I could be wrong, but working exapmples seem to get the point across a triffle better than a+bXz^c/a million+3.14 etc...)

 

 

Why not do it with the you used? 50 mph is about 22.3ms^-1.

 

(22.3 + 22.3)/(1+22.3*22.3/299792458^2) is what you're looking for. Which is about 44.6/1.0000000000001, or thereabouts (0's aren't exact, just 'a line of zeros'), which will be just less than 44.6ms^-1.

 

And after one hour, they would be about 99.999999999999998 whatever miles apart.

Phew, and I thought I was the only one there for a sec

Cap'n Refsmmat said in post # :

It looks right! I just don't see what MRL is saying.

 

All rest frames are equally valid, is what I am saying.

then maybe you`de like to explain how a GPS works, are you saying they too are wrong when they give the current velocity of your vehicle?