On Tuesday, December 10, 2024 at 11:36:19 AM UTC-7 Quentin Anciaux wrote:
Le mar. 10 déc. 2024, 19:31, Alan Grayson <[email protected]> a écrit : On Tuesday, December 10, 2024 at 11:07:25 AM UTC-7 Alan Grayson wrote: On Tuesday, December 10, 2024 at 6:29:25 AM UTC-7 John Clark wrote: On Tue, Dec 10, 2024 at 5:47 AM Quentin Anciaux <[email protected]> wrote: >> *My conclusion is that there's a contradiction in evidence, since the situation of the car fitting and not fitting makes no sense. AG * *>>And the answer only lies in disagreement of simultaneity of both doors being closed and the car fully inside the garage, and that is dependent on the frame of reference, there aren't any contradictions.* *Exactly! In Special Relativity two observers in different frames of reference can disagree about what order a series of events should be in, provided that the events are "spacelike separated", that is to say if even the speed of light is not fast enough to send a signal between them. One observer could say events should be ordered XYZ and another insist the order should be XZY. The classic example is two lightning strikes hitting the front and back of a very fast moving train, an observer on the train might see them as simultaneous but an observer on the ground see one hit happening before the other. * *And in the example that Alan has trouble with, one observer might say the back of the car entered the garage before the back door of the garage was opened, and another observer in a different frame of reference would say that happened after the back door of the garage was opened. So one would say the car was able to fit into the garage and the other would say it could not.* * John K Clark * *Apparently you haven't read my posts or don't understand them. If the initial conditions are set so the car's length is longer than the garage, and then the car is set in motion, the car is NEVER inside the garage since the garage is contracting! In this situation, there would be no measurements that you allege for which simultaneity would apply. There is NO entering of the garage for the car! AG * *Further, you bring up spacelike separated events to allegedly make your points. But as far as I can tell, no events in this situation are spacelike separated. AG * So the front door, the back door, the front of the car, the rear of the car are all at the same spacelike location? I don't call that doors or cars, I call that a point, and there are no paradoxes *You don't get it. The car is never inside the garage, given the initial conditions. AG * -- 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 view this discussion visit https://groups.google.com/d/msgid/everything-list/239821ec-3e92-43fa-9b04-ae9c4ad4893dn%40googlegroups.com.
