On Tuesday, December 17, 2024 at 9:05:09 PM UTC-7 Jesse Mazer wrote:

On Tue, Dec 17, 2024 at 10:52 PM Alan Grayson <[email protected]> wrote:



On Tuesday, December 17, 2024 at 6:57:28 PM UTC-7 Alan Grayson wrote:

I 

On Tuesday, December 17, 2024 at 2:33:46 PM UTC-7 Brent Meeker wrote:

On 12/17/2024 9:25 AM, Alan Grayson wrote:


Yes, you look at it just in terms of lengths, which is what I did in the 
first pair of diagrams.  But the relativity of simultaneity is another 
way to look at the same problem, which is what I showed in my last posting.


*Another way, but not the only way. AG *


We seem to be on the same page concerning use of length contraction to 
explain the
differing results in the frames under consideration. But I remain unclear 
how the
disagreement of simultaneity can also give the same results. For example, 
suppose
from the pov of the garage frame, the car fits in the garage for sufficient 
v, with room
to spare, but the front and rear end EVENTS do not Lorentz transform into 
simultaneous
events in the car frame. Can't there be other ways for the car to fit, 
using another set 
of events which* are* simultaneous in the car frame? AG 


For any pair of events on the worldlines of the front and back of the car 
which are simultaneous in the car frame, rhe distance between that pair of 
events in the car frame is always 12.

 
OK, AG
 

And for any pair of events on the worldlines of the front and back of the 
*garage* which are simultaneous in the car frame, the distance between that 
pair of events in the car frame is always 6. 


Don't follow. AG
 

So no matter what pair of events you choose for car and garage, if they are 
simultaneous in the car frame the car is always too long to fit in the 
garage as measured in the car frame.


Right. The car NEVER fits in garage from the pov of car frame. How could 
it? It starts out longer than the garage, and when moving the garage length 
gets even smaller due to length contraction. AG 


Jesse

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