Re: Proper quantities in SR

"Sue..." <suzysewnshow@xxxxxxxxxxxx> wrote in message
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On Jul 3, 8:30 pm, "Jeckyl" <n...@xxxxxxxxxxx> wrote:
"Sue..." <suzysewns...@xxxxxxxxxxxx> wrote in message
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On Jul 3, 8:07 pm, "Jeckyl" <n...@xxxxxxxxxxx> wrote:
"Sue..." <suzysewns...@xxxxxxxxxxxx> wrote in message

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On Jul 3, 10:37 am, "Jeckyl" <n...@xxxxxxxxxxx> wrote:
"Sue..." <suzysewns...@xxxxxxxxxxxx> wrote in message

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On Jul 3, 2:50 am, "rot...@xxxxxxxxx" <rot...@xxxxxxxxx> wrote:
I dunno. To me, "proper" always means "in the object's rest
frame",

That's the general idea but that is not always its meaning in
physics.

Eg. proper time between two events: no "objects" involved; or,
is
the
observer the object? If so then proper time is frame dependent
and
thus not 'constant', not an absolute quantity.

But "proper mass" (just "mass") has the same value in any
frame.

Depending on the definition or context of 'proper', it is not
necessarily an 'absolute'.

Clocks are not affected by motion but a clock moving away from
you will appear to be because light has a finite propagation
speed.

You make it sound like its just an illusion .. its not

You need to address that issue with the theory's author:

<< As judged from K, the clock is moving with the
velocity v; as judged from this reference-body, the
time which elapses between two strokes of the clock
is not one second, but

http://www.bartleby.com/173/M5.GIF

seconds, i.e. a somewhat larger time >>
http://www.bartleby.com/173/12.html

Judgement from K includes a light path of
increasing length.

That is not consistent with your clain that clocks are NOT affected by
motion, and that it just appears that way (some sort of optical
illusion)

I supposed you missed that part on that page where it says "As a
consequence
of its motion the clock goes more slowly than when at rest"

Maybe YOU should read more carefully

That interpretation would imply instantaneous light propagaion
over the distance.

Nonsense .. it does nothing of the sort .. please. . try to read and
understand

A racer of 50Km/hr pigeons releases 1 bird every 5 min
from a 100Km/hr truck. His wife at the loft receives the
pigeons at intervals not of 5 min but
"a somewhat larger time" You are suggesting the
someone's watch is responing to the motion and
the finite speed of the birds shouldn't be considered.

Not at all . when considering question of light propogation, you need to
take the speed that light travels into account.

But we were talking about clocks and lengths. Not about light proprogation.

The slowing of clocks and contracting of length as projected into another
realtively moving frame of reference is not some optical illusions due to
the speed the light is travelling. Even if you COULD instantaneously get
information about the lengths and clocks, you'd still end up with length
contraction and time dilation being 'seen'.

Are you as good with primary school maths as you are
with SR?

Yes .. equally proficient. SR is not really that difficult .. you should
try to understand it too .. you might get it one day.



.

Relevant Pages

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