On Tue, Dec 17, 2024 at 4:10 AM Alan Grayson <[email protected]> wrote:
> > > On Wednesday, December 4, 2024 at 2:06:41 PM UTC-7 Alan Grayson wrote: > > In the case of a car whose rest length is greater than the length of the > garage, from pov of the garage, the car *will fit inside* if its speed is > sufficient fast due to length contraction of the car. But from the pov of > the moving car, the length of garage will contract, as close to zero as one > desires as its velocity approaches c, so the car *will NOT fit* *inside* > the garage. Someone posted a link to an article which claimed, without > proof, that this apparent contradiction can be resolved by the fact that > simultaneity is frame dependent. I don't see how disagreements of > simultaneity between frames solves this apparent paradox. AG > > > Let's go back to square one. The car fits in garage from the garage frame > due to contraction of the car's length, which in rest frame is longer than > the garage. And to get the fit we need to invoke simultaneity of the front > and rear ends of the car. OTOH, from the frame of the car, which in rest > frame is longer than the garage and won't fit within it, when the car is > set in motion, the garage's length shrinks, so a possible fit becomes evev > more impossible. It is claimed that this apparent paradox -- and I fail to > see a paradox -- is resolved due to the disagreement of simultaneity > between the frames. But I don't see any need to introduce simultaneity. > From the car's frame, the garage's length has *decreased *from its rest > length, where it couldn't fit, and now imaging a fit is *worse* than the > initial situation. So, what has simultaneity have to do with the solution? > Apparently nothing! AG > Simultaneity is relevant because if all frames shared the same definition of simultaneity, then a disagreement between frames about whether the car or garage was shorter would automatically imply a real physical disagreement in predictions about local events (like what clocks mounted to front and back of car read when they pass clocks mounted to front and back of garage), in which case it would be impossible for both frames' predictions to be correct if you tested the scenario. Jesse > -- > 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/3ea4ac56-4331-4bc3-9a4e-6bb4c423126an%40googlegroups.com > <https://groups.google.com/d/msgid/everything-list/3ea4ac56-4331-4bc3-9a4e-6bb4c423126an%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CAPCWU3LY%3Dz-GNGDCWZ0AN_rodA%2BT6%2BOwhiS-SOGs0DidwgpZhQ%40mail.gmail.com.
