During the middle of the Eocene, about 40 million years ago...

"Peter Webb" wrote in message
...
|
| "Androcles" wrote in message
| ...
|
| "Peter Webb" wrote in message
| u...
| | | | |
| | | | | See Hafele-Keating, they flew clocks around the world
and
| it
| | is
| | | | shorter
| | | | | from
| | | | | London to Sydney than Sydney to London. Distance is a
| vector,
| | time
| | | is
| | | | not.
| | | | | So you don't believe in the experimental predictions of
| | | relativity?
| | | | |
| | | | |
| | | | | Distance is no more a vector than time is.
| | | |
| | | | Is velocity a vector, ****head?
| | | |
| | | |
| | | | Yes, velocity is a vector.
| | |
| | | Is speed a vector, ****head?
| | |
| | |
| | | No.
| |
| | What's the difference between "Geschwindigkeit" (German for speed)
| | and "Geschwindigkeit" (German for velocity)?
| |
| |
| | Dunno exactly.
|
| The difference is direction.
|
| And if you don't know enough English to understand the English words for
| magnitude and direction,
|
| I do. The words you asked about were in German.

No you don't, you hallucinate distance is a scalar.


| you shouldn't try and learn basic vector algebra
| from books written in English. I would have thought this to be obvious.
| There are lots of books in English on the subject.
|
|
| I first studied Vector algebra and vector calculus over 30 years ago, and
| feel I have a pretty good understanding of the subject.

No you don't. You hallucinate distance is a scalar.

| That is why I was happy to answer your questions.

What's the difference between "Geschwindigkeit" (German for distance/time),
a magnitude, and "Geschwindigkeit" (German for (directional
displacement)/time)
a vector?

You dunno.

Not my fault if German has the same word for both and English "distance"
means a vector and a magnitude. That's why we use a minus sign in
mathematics. Distance is a vector. You only need to flip a ruler to
understand it,
the 12 appears on the left instead of the right. Minus is a "rotate 180
degrees"
unary operator. i = sqrt(-1) is a rotate 90 degrees operator. (-1 + i) is a
vector.

Not my fault you've never understood vector algebra.


| |
| |
| | What's the difference between velocity from A to B and velocity from
B
| to
| | A?
| |
| | Hint: a minus sign.
| |
| |
| | If you say so. I can't see any reason why a particle couldn't travel
| from
| A
| | to B at a completely different speed to that which it moves from B to
A.
|
| I do say so. Velocity is a vector and so is distance, it has direction
| too.
|
|
| Just because two things are both vectors doesn't mean that one of them is
| neccesarily minus one times the other one.

Learn to spell, low life.
Speed is a magnitude, velocity is a vector. Distance is NECESSARILY a
vector.
So you don't believe the experimental predictions of relativity because
you necessarily don't understand what distance/time is and have a low IQ,
obviously, since you can't spell.