Please help a retard (Eienstien)


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Topic: Science > Physics
User: "Job"
Date: 03 Nov 2004 02:39:59 AM
Object: Please help a retard (Eienstien)
It bothers me.
Yes, it's about Spaceships [yukk].
Ship A approaches a point xyz at 0.75 light.
Ship B approaches a point xyz at 0.75 light.
They are approaching one another for an aligned collision.
How can these objects have a Diff of 1.50 of light speed ?
Tell me how then the top speed is 1.0 ?
I'm a simple engineer, not a theorist or a "hoodoo".
Can _any_ real physical observation show me this ?
-Job-
.

User: "Bjoern Feuerbacher"

Title: Re: Please help a retard (Eienstien) 03 Nov 2004 03:34:13 AM
Job wrote:

It bothers me.
Yes, it's about Spaceships [yukk].


Ship A approaches a point xyz at 0.75 light.

Ship B approaches a point xyz at 0.75 light.

As measured by an observer resting at xyz (or at least resting wrt xyz),
presumably.

They are approaching one another for an aligned collision.

How can these objects have a Diff of 1.50 of light speed ?

Depends on from where you look. The observer who sits at xyz will say
that the ships apparently have a velocity of 1.50 of light speed (c)
with respect to each other. However, observer in ship A (or ship B) will
measure that ship B (or ship A) approaches them at only 0.96 c.
That is essentially a consequence of time dilation.

Tell me how then the top speed is 1.0 ?

If you want to know the relative speed between A and B, as seen from
someone resting in A or B, you can't simply add the velocities of A
and B wrt the point xyz. You have to use the following formula:
v_AB = (v_A + v_B)/(1 + v_a v_B/c^2),
which gives the 0.96 c I mentioned above.
Notice that for arbitrary velocities v_A and v_B which are smaller or
equal to c, this formula will always give a v_AB which is smaller or
equal than c.

I'm a simple engineer, not a theorist or a "hoodoo".
Can _any_ real physical observation show me this ?

Well, there was an experiment where (gamma) radiation from decaying
particles was observed, which moved with speed very close to c in the
lab. The speed of this radiation was observed to be c wrt the lab - and
obviously it is also c wrt the decaying particles. Does that help you in
any way?
Bye,
Bjoern
.

User: "Helmut Wabnig **************"

Title: Re: Please help a retard (Eienstien) 03 Nov 2004 05:29:26 AM
On Wed, 03 Nov 2004 08:39:59 GMT, Job <Withheld@withheld.withheld>
wrote:

It bothers me.
Yes, it's about Spaceships [yukk].


Ship A approaches a point xyz at 0.75 light.

Ship B approaches a point xyz at 0.75 light.

They are approaching one another for an aligned collision.

How can these objects have a Diff of 1.50 of light speed ?

Tell me how then the top speed is 1.0 ?


I'm a simple engineer, not a theorist or a "hoodoo".
Can _any_ real physical observation show me this ?

2 ducks in a pond, they swim and dive for worms etc.
they cause circular waves expanding, each one.
Note, those waves travel with a certain speed.
Ducks start swimming towards each other, at slow speed.
Note, those waves travel with the same speed as before,
regardless of the duck's swimming efforts.
Note, wave crests are at smaller distance now,
which means, frequency is higher, get it?
This mechanical analogy ends when the ducks
start swimming near equal or faster than wave speed.
Why is that, can you figure yourself, Mr. Retard?
w.
.
User: "Helmut Wabnig **************"

Title: Re: Please help a retard (Eienstien) 03 Nov 2004 05:34:36 AM
On Wed, 03 Nov 2004 12:29:26 +0100, Helmut Wabnig <**************>
wrote:

Note, wave crests are at smaller distance now,
which means, frequency is higher, get it?

only in front of the ducks, to be precise.
.



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