On Wed, Feb 5, 2014 at 11:02 AM, Edgar L. Owen <[email protected]> wrote:
> both A and B experience the exact same 1g acceleration for the entire > trip. > Not if A comes to his destination AND STOPS. > A's watch doesn't suddenly spring back thousands of year in the second he > finally cuts off his acceleration. > True, but if A decelerated so quickly he came to a complete stop relative to Earth in just one second then A will observe (assuming he has somehow avoided being turned into a very very hot plasma, don't ask me how) that B's watch springs FORWARD thousands of years in that one second. > Both A and B will each see each other's clock slowing > Yes. > but when A reaches his destination only his clock will ACTUALLY be slowed, > Only if A comes to a stop, and that can only happen is A starts to accelerate in the opposite direction. If A does not stop then both will continue to see each others clock as running slow. > and both A and B will agree on that. > If A comes to a stop then both A and B will agree that their experiences were NOT symmetrical, and both would agree that the readings on their watches were not the same. John K Clark > AND the accelerations of both A and B are both exactly equal 1g during the > entire trip. > > So why is that? > > Edgar > > > > On Tuesday, February 4, 2014 1:02:52 PM UTC-5, John Clark wrote: >> >> On Mon, Feb 3, 2014 at 3:29 PM, Edgar L. Owen <[email protected]> wrote >> >> >> > The question is why when A gets to the center of the galaxy and stops >>> >> >> That's the key point to remember, A comes to a stop. And during the >> deceleration process things would no longer be symmetrical, A would see B's >> clock running Fast but B would see A's clock running slow. So A would have >> aged less than B. >> >> > relative to B that then his clock shows only 20 years passage, but B's >>> clock shows 30,000+? >>> >> >> Actually if you work out the numbers you find that if A accelerated at >> one g for 20 years ship time he'd only be 137 light years from Earth. After >> 40 years ship time A would be 17,600 light years from Earth, and after 60 >> years ship time A would be 2,480,000 light years from Earth and be at the >> Andromeda Galaxy, although we on the Earth would have to wait 5 million >> years to see A's ship get to Andromeda, and unfortunately he'd be going >> much too fast to stop and sightsee. >> >> >>> > Perhaps you didn't see my similar questions to Brent, to which he has >>> either been unwilling or unable to reply, about this case. He says it's a >>> matter of geometry, but neglects to point out that geometry must have its >>> origin at B's earth bound frame. >>> >> >> You can pick any point of origin and you will get the same answer, but >> it's wise to pick an origin that makes the mathematics the easiest. >> >> John K Clark >> >> >> >> >> >> -- > You received this message because you are subscribed to the Google Groups > "Everything List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/everything-list. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/everything-list. For more options, visit https://groups.google.com/groups/opt_out.
