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From: Khattak on 12 Apr 2010 00:07
Let a spaceship of width 30, 00,000 km and length say 10 meter
(adjusted with length contraction) is moving with 0.9c. Let a beam of
light/ pulse is moving perpendicular to the direction of spaceship.
For simplicity assume a pulse of light travel from north to south and
spaceship is moving from east to west. After sometime the same pulse
of light
Strikes and enters spaceship through its one longitudinal side of 10 m
Travel inside spaceship and then
Leaves the spaceship through its other longitudinal side
Can we trace the path of pulse for both inside and outside observer
while keeping in mind the Einstein postulates? Thanks
From: Inertial on 12 Apr 2010 00:14

"Khattak" <zarmewa(a)gmail.com> wrote in message
news:800804db-3adc-4d36-b4a5-4f17c2fab62c(a)y14g2000yqm.googlegroups.com...
> Let a spaceship of width 30, 00,000 km and length say 10 meter
> (adjusted with length contraction) is moving with 0.9c. Let a beam of
> light/ pulse is moving perpendicular to the direction of spaceship.
> For simplicity assume a pulse of light travel from north to south and
> spaceship is moving from east to west. After sometime the same pulse
> of light
> Strikes and enters spaceship through its one longitudinal side of 10 m
> Travel inside spaceship and then
> Leaves the spaceship through its other longitudinal side
> Can we trace the path of pulse for both inside spaceship and outside
> observer while keeping in mind the Einstein postulates? Thanks

Why would you think we couldn't. The path doesn't depend on whether an
observer is inside of outside the spaceship. Nor does travelling thru the
spaceship change the path.

The path is determined by the relative speed and direction of the observer
compared to that of the light.

From: Inertial on 12 Apr 2010 00:14

"Khattak" <zarmewa(a)gmail.com> wrote in message
news:ec155ea9-d4fc-4b87-9dbf-1f78208daccf(a)g11g2000yqe.googlegroups.com...
> Let a spaceship of width 30, 00,000 km and length say 10 meter
> (adjusted with length contraction) is moving with 0.9c. Let a beam of
> light/ pulse is moving perpendicular to the direction of spaceship.
> For simplicity assume a pulse of light travel from north to south and
> spaceship is moving from east to west. After sometime the same pulse
> of light
> Strikes and enters spaceship through its one longitudinal side of 10 m
> Travel inside spaceship and then
> Leaves the spaceship through its other longitudinal side
> Can we trace the path of pulse for both inside and outside observer
> while keeping in mind the Einstein postulates? Thanks

spammer

From: Sue... on 12 Apr 2010 00:45
On Apr 11, 5:31 pm, Tom Adams <tadams...(a)yahoo.com> wrote:
> Suppose two space ships, A and B, were in Sun orbit side by side each
> with mutually synced clocks.   A large mass object came by and pulled
> one of the space ship A out of Sun obit, leaving B in behind in Sun
> orbit.   A takes quite a trip, pulled around by the gravity of various
> massive objects that just happen to fly by.  A travels many light
> years reaches high speeds relative to B.  But the clocks in both ships
> remain in weightless conditions the whole time.  A eventually ends up
> back in Sun orbit beside B.
>
> Will the clocks still be in sync?
>
> I would guess Yes, since both A and B were in inertial conditions the
> whole time.

Note that the trajectory of a bullet fired inside
Ship A will become flatter as the perturbing body
approaches and counters the sun's gravity.
It will take less time to reach the end of
a metre stick. Faster clock.

The bodies that pull ship A back toward the
sun will act with the sun and curve a
bullet's trajectory more. Slower clock.

The difference at reunion would seem to
depend on which ship spent the most
time on the straightest trajectory.
(no neighbours or homogeneously distributed neighbours)

<<... in a static gravitational field the frequency ω of the
photon is a constant; it is equal to the frequency at emission.
The phenomenon of gravitational redshift is explained by the
increase of the energy difference between levels
in atoms or nuclei (in general, by the increase of the
rate of clocks) with the increase of their distance from
the gravitating body. The constant energy of
photon appears as redshifted with respect to the blueshifted
energy difference of atomic levels. >>
http://arxiv.org/abs/hep-ph/0010120v2

Pound, R. V.; Snider J. L. (November 2, 1964).
"Effect of Gravity on Nuclear Resonance
http://link.aps.org/abstract/PRL/v13/p539

http://en.wikipedia.org/wiki/Pound%E2%80%93Rebka_experiment

Sue...




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