There are 2 ships that are passing each other at high speed.

Z

Zeno

Registered Senior Member
Special relativity....
Ship1 at rest at top:
T--------------------N
<----- N-----------T

Ship2 at rest at bottom:
T----------N ----->
N--------------------T

T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
 
Your diagram does not show which is T1 and which is T2, or N1 and N2?
 
Zeno said:
Special relativity....
Ship1 at rest at top:
T--------------------N
<----- N-----------T

Ship2 at rest at bottom:
T----------N ----->
N--------------------T

T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
Click to expand...
Один корабль плывёт на поверхности, его лампы находятся в воздухе. Другой плывёт по дну, его лампы находятся в воде. Свет от ламп распространяется с разной скоростью в средах с разной плотностью. Вы это имели ввиду?
 
At the moment that T1 is lined up with N2, T2 has both passed and not passed N1. That should be enough information to answer the question.


Это два корабля, пролетающих друг мимо друга на большой скорости в космосе. Вода здесь не участвует.
 
Zeno said:
At the moment that T1 is lined up with N2, T2 has both passed and not passed N1. That should be enough information to answer the question.


Это два корабля, пролетающих друг мимо друга на большой скорости в космосе. Вода здесь не участвует.
Click to expand...
Тогда при чём здесь "дно"? Или это некорректный ппревод?
 
Zeno said:
Special relativity....
Ship1 at rest at top:
T--------------------N
<----- N-----------T

Ship2 at rest at bottom:
T----------N ----->
N--------------------T

T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
Click to expand...
The distances and velocities matter
 
Zeno said:
At the moment that T1 is lined up with N2, T2 has both passed and not passed N1. That should be enough information to answer the question.


Это два корабля, пролетающих друг мимо друга на большой скорости в космосе. Вода здесь не участвует.
Click to expand...
OK, so N1 and N2** are 3 angstroms apart...
And T1 and T2 pass with a twelve light year gap between them.
Aaaand GO.

** not labeled in diagram


Followup question: How many pancakes does it take to cover a doghouse?
Followup followup question: Something about angels and pin heads.
 
My prediction:
Step 1. OP will say "It's easy!" and "You have everything you need to solve it!" and "You're all dumb if you can't figure this out!".
Step 2. OP will then solve it for us, listing all the critical assumptions they've made to solve it but that they didn't bother sharing when we asked for them.
 
Special relativity....

Ship1 at rest at top:

1 light-year
T--------------------N
N-----------T <-------- .8c
.6 light-year

Ship2 at rest at bottom:

.6 light-year
T----------N -------> .8c
N--------------------T
1 light-year

The spaceships are each 1 light-year long and are passing each other at .8c. So each ship is contracted to .6 light-year when viewed from the other ship.

T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
 
Zeno said:
Special relativity....

Ship1 at rest at top:

1 light-year
T--------------------N
N-----------T <-------- .8c
.6 light-year

Ship2 at rest at bottom:

.6 light-year
T----------N -------> .8c
N--------------------T
1 light-year

The spaceships are each 1 light-year long and are passing each other at .8c. So each ship is contracted to .6 light-year when viewed from the other ship.

T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
Click to expand...
One light year long moving at 0.8C? So a realistic scenario then?
Ok this is easy.
There is no force transfered at that speed in a rigid body.
 
DaveC426913 said:
My prediction:
Step 1. OP will say "It's easy!" and "You have everything you need to solve it!" and "You're all dumb if you can't figure this out!".
Step 2. OP will then solve it for us, listing all the critical assumptions they've made to solve it but that they didn't bother sharing when we asked for them.
Click to expand...
You've left out one element: he will also get it wrong. :biggrin:

My guess, though I could be mistaken, is he can't get his head round the relativity of simultaneity. A check of his past posts does not give much hope he knows what he is doing. He's been struggling with this kind of thing for years, along with denying evolution. :rolleyes:
 
Last edited:
Zeno:

You've been asking about these kinds of scenarios for almost 3 decades now. Given that you've had so long to work them out, why haven't you arrived at the answers you want, yet?

Zeno said:
Special relativity....
Ship1 at rest at top:
T--------------------N
<----- N-----------T

Ship2 at rest at bottom:
T----------N ----->
N--------------------T

T1 and T2 both have a lamp with a lightbulb. Both lamps are initially off. When T1 is lined up with N2, T1 turns on his lamp. When T2 is lined up with N1, T2 turns on his lamp. When T1 turns on his lamp is T2's lamp on or off?
Click to expand...
As you must surely be aware after 3 decades of this stuff, when you say something like "When T1 turns on his lamp", you need to specify which reference frame you're interested in.

So, which is it? Do you want to examine the event "T1 turns on his lamp" in Ship 1's reference frame, or Ship 2's reference frame?

Why haven't you worked the problem yourself already? After all, you were first introduced to the relevant mathematics almost 3 decades ago. Have you practiced any problem-solving since then?
 
Zeno said:
At the moment that T1 is lined up with N2, T2 has both passed and not passed N1. That should be enough information to answer the question.
Click to expand...
The question is ambiguous, because you failed to specify the frame of reference in which you want the answer.
 
You must log in or register to reply here.
Back
Top