Talk at the Speed of Sound: Can 2 People Chat?

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Two people traveling above the speed of sound in a ship can communicate with each other due to the air surrounding them moving at the same speed. However, sound waves cannot travel between two supersonic objects moving in parallel. Additionally, survival on an open deck during supersonic travel is impossible due to lack of breathable air. Therefore, while communication is feasible within the confines of a ship, it is not possible between separate supersonic entities. The discussion highlights the complexities of sound transmission in supersonic conditions.
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If two people where traveling above the speed of sound in a ship, could they talk to each other?
 
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in a ship or on its open deck?

Of course, two pilots of supersonic plane may talk to each other, as the air surronding them travel at the same speed as they do.

But you can't send a sound wave from one supersonic object to onother one traveling in parallel.

And - of course - no one may survive supersonic travel on an open deck: you couldn't breathe in such conditions.
 

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