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   From: Luigi Fortunati    
   Newsgroups: sci.physics.research   
   Subject: Re: Apparent rotation   
   Date: Wed, 11 Jan 2023 10:58:51 PST   
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   From: fortunati.luigi@gmail.com   
      
   Phillip Helbigundress to reply mercoled=EC 11/01/2023 alle ore 09:32:14   
   ha scritto:   
   >> Why bother the distant universe if rotation (like any other   
   >> acceleration) are "absolute"?   
   >>   
   >> Matter is made up of atoms with a nucleus inside.   
   >>   
   >> If we rotate the matter (ie the atoms) the nuclei that "float" inside   
   >> them "push" outwards and generate centrifugal force opposed by the   
   >> centripetal force of the molecular bonds.   
   >>   
   >> The presence of these two opposing internal forces of matter is   
   >> confirmed by the internal tension of the rotating bodies.   
   >   
   > Yes.  No-one debates the fact that accelerations are absolute.  The   
   > question is WHY that is the case.  Imagine an empty universe with one   
   > object in it, say a merry-go-round.  Should it be possible to tell if it   
   > is rotating, as it would be under normal conditions?  If so, with   
   > respect to what is it rotating?  There is nothing else in the Universe.   
      
   There is a contradiction in what you write.   
      
   First you say that accelerations are absolute and then you ask "with   
   respect to what is it rotating?".   
      
   If they are absolute, they cannot depend on the reference!   
      
   I say that the "real" rotations (those where centripetal and   
   centrifugal forces are manifested) are absolute and the "apparent"   
   rotations (those where neither centripetal nor centrifugal forces are   
   manifested) are relative.   
      
   In an empty universe there could be only real rotations, those where   
   the question "with respect to what is it rotating?" it has no reason to   
   exist,being absolute and not relative.   
      
   > Some would claim that there would be no way to tell in such a case, i.e.   
   > no inertia.   
      
   I did not get this.   
      
   Do you think that in a completely empty universe there would be no   
   centripetal and centrifugal forces?   
      
   What does it mean: there would be no inertia?   
      
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