Paradoxes and Dilemmas

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>[makis]So basically there is no universal time since, if we see a clock some place very far in the universe will will have no way of knowing if it is corrected or not. Therefore, in an emtpy universe there can be universal time, but as soon as a gravity potential is introduced, time universality is lost. I think Einstein's ghost will haunt us forever.<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Clocks at sea level all tick at the same rate. Clocks on mountains must be corrected to run at the rates they would have if they were at sea level. GPS clocks must be corrected to run at the same rate as clocks on Earth. Clocks anywhere in the universe can be corrected to run at the rate of Earth clocks. Doesn't that meet your idea of a "universal time"?

In any case, "gravitational clocks" (as in the force peaks from a binary pulsar) would be unaffected by speed or potential, and could serve as universal as well. -|Tom|-

<BLOCKQUOTE id=quote><font size=2 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>... would ultimately require speeds of c^2 ...<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

???

c^2 is not a speed. Speed has units of distance over time, not distance^2 over time^2. And not (distance over time)^2

Is this a typo?

Regards,
LB

Patrick says it takes more effort to walk to the front of a train than walking to the rear of the train. Can this be true or is there some error here?

Two items come to mind reading the latest post here; First, the train thing is about time and if it takes more effort to go foward at a rate of speed near C than to go in reverse then Patrick is right. Second, if time is measured from the moment of the BB; do clocks on mountain tops run slow?

It seems to me you are playing games with symbols by saying things like C="0" and other such items. The idea I'm wondering about is the comment on setting time at a start at the moment of the BB start. Doing so should end the slow running clock caper.

Don't leave out the point that it takes exactly the same effort to run to the front or back of the moving plane or train. Your prior example was then false the walk to the front of the train did not require more effort than the walk to the rear. At ~C speed this is just the reverse-it takes more effort to walk to the front,right?