Re: Twin paradox revisited ll


"bill" <cosmosco@xxxxxxxxxxxxxxx> wrote in message news:1185339722.394291.34610@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Jul 24, 6:55 pm, "Martin Hogbin" <goatREMOVETHIS...@xxxxxxxxxx>
wrote:
"bill" <cosmo...@xxxxxxxxxxxxxxx> wrote in messagenews:1185235954.440484.53780@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I agree that the travelling twin will see that the earth clock
*appears* to be running slower than his own clock but if he insists
that it *is* physically ticking...

Perhaps this scenario might help.

We have two identical spaceships travelling at constant high speed in
opposite directions such that they pass very close to one another.

On each ship there are two clocks, synchronised when they are
together at the centre of the craft and then carefully carried,
one to each end.

On one spacecraft two observers, one by each clock, note the
time on their own clock that the front clock of the other craft
passes by them. They also note the reading on the passing
clock We assume that the daredevil pilots steer the
ships within inches of one another, so the transit time of the
light or radio signal required to do this is insignificant.

By this means we have a direct reading of the rate of one
clock on spacecraft as measured by two synchronised
clocks on the other.

Observers on the other craft do exactly the same thing.

According to SR, each team will measure the clocks on
the other spacecraft to be running more slowly than their
own.


--
Martin Hogbin



.

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