From: starmaker@ix.netcom.com   
      
   Python wrote:   
   >   
   > Le 20/01/2026 à  14:51, "Paul B. Andersen" a écrit :   
   > > Den 18.01.2026 18:17, skrev Ross Finlayson:   
   > >>   
   > >> I'm glad that you consider at least one degree of acceleration,   
   > >> with respect to velocity, eg dv/dt, yet, there are _infinitely-many_   
   > >> higher order derivatives of acceleration, _any one of which_ is   
   > >> nominally non-zero given any smoothly changing velocity.   
   > >>   
   > >>   
   > >> Then, you should get to wondering about the equivalence principle,   
   > >> and whether's gravity's perceived force of acceleration is really   
   > >> equivalent to reaction-mass acceleration, or about how it's not,   
   > >> since as lots of physics departments note the equivalency principle   
   > >> is violated a lot, just like momentum is lost in the wash in kinematics   
   > >> generally.   
   > >   
   > > You are standing on the floor in a small room   
   > > without windows with an accelerometer fixed to the wall.   
   > > The accelerometer shows that it is accelerating   
   > > in the direction which to you is upwards.   
   > >   
   > > If the accelerometer shows that the acceleration   
   > > is constant 1g, then there is no way you can   
   > > decide whether you are stationary at the ground,   
   > > or if you are accelerating at 1g in a spaceship.   
   > >   
   > > If the accelerometer shows that the acceleration   
   > > is changing with time, then you know that you are   
   > > in a spaceship.   
   >   
   > Couldn't I be at the surface of a planet which is increasing its mass for   
   > some (unrealistic) reason?   
      
   The earth is a spaceship...   
      
   i seem to be traveling in circles.   
      
   i'm getty dizzy.   
      
      
   stop, i wanna get off!   
      
      
      
      
      
      
      
      
      
      
   --   
   The Starmaker -- To question the unquestionable, ask the unaskable,   
   to think the unthinkable, mention the unmentionable, say the unsayable,   
   and challenge the unchallengeable.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)