Re: More speed confusion

Androcles <Headmaster@xxxxxxxxxxxxxxxx> wrote in message
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"Paul B. Andersen" <paul.b.andersen@xxxxxxxxxxxxxxx> wrote in message
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Peter Riedt wrote:
On May 27, 3:30 am, "Paul B. Andersen"
<paul.b.ander...@xxxxxxxxxxxxxxx> wrote:
Peter Riedt wrote:
Androcles, excellent and comprehensive derivation resulting in the
answer 1=1.
To which I like to add, if we add the speed of light to any other
speed up to 300000km/sec, the answer is always 300000km/sec but if we
subtract the speed of an object from the speed of light using the
formula(c-v)/(1+c*v/c^2)[negative closing speed as in source and
target approaching each other] the result is less than c-v e.g.
for 300000km/sec-30km/sec the composite speed is not 299970km/sec but
299940.006km/sec. However if both c and v are 300000km/sec, they
approach each other at a whopping c-v = 0km/sec!
Peter Riedt
The correct formula is: (c-v)/(1-c*v/c^2) = c

--
Paul

http://home.c2i.net/pb_andersen/

Paul, agreed.
(300000-300000)/(1-300000*300000/300000*300000)=0

No.

0/0 is undetermined, it's not zero

But lim[(c-v)/(1-c*v/c^2)] = c when v -> c

Note that the "speed addition formula" is a misnomer,
it is a speed tranformation formula.
If the speed of an object is u in an inertial frame K,
then this speed transforms to w in a frame K' which is
moving with the speed v relative to K, where
w = (u+v)/(1+u*v/c^2)

The 'object' can be light (or a photon) and thus u = c,
but the speed of frame K' relative to frame K cannot be c,
so both u and v can never both be c.
v can however be arbitrary close to c, so the speed c
will _always_ transform to c for all v.


--
Paul
Bwahahahaha!
So much fun to see you squirming with simple algebra, Tusseladd,
and how you hope to take a limit!

"lim[(c-v)/(1-c*v/c^2)] = c when v -> c ".. ahahahahahahaha!
Pity a spread*** doesn't agree with you!

But then, you are proven liar as well as a idiot, anyway.
http://www.androcles01.pwp.blueyonder.co.uk/E%5E2/DeriveMC2.htm

Brilliant - as always:
http://users.telenet.be/vdmoortel/dirk/Physics/Fumbles/SpreadsheetLimit.html

Dirk Vdm

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