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Can you determine absolute motion? 
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#127
May1511, 06:14 AM

P: 3,187

Was your first post of this thread sufficiently answered? Assuming that relativity is correct, "The Omnipotent Point of view" cannot be disproved by experiments  as JesseM also mentioned. Perhaps because it has no practical use (how could we use a view that we can't determine!), it's less well known from the peer reviewed literature. Relativity jargon is positivistic: only operational definitions are used, based on phenomena (appearances). Now, "Light approaches any reference point at C" is poorly stated, and therefore true or false depending on your references. The approaching speed of light is "relative" to the used reference system: it is set by definition equal to the receding speed in special relativity. You can read the definition here, in section 1: http://www.fourmilab.ch/etexts/einstein/specrel/www/ As a result, the (apparent) "closing" or "approaching" speed has been made c wrt a reference point that is at rest in the reference system that you use, by appropriately regulating the clocks (see also Einstein 1907, Jahrbuch Radioelectr. Electr.4, 414). It seems that you correctly understood that it is not c relative to a point that is "moving" in your reference system  indeed, that would be paradoxical, as the vector subtraction (cv) with c=constant and v=/=0 cannot equal c. The impossibility to determine absolute motion (in the original, Newtonian sense) is directly related to the impossibility to determine the absolute oneway closing speed of light, which in turn is directly related to relativity of simultaneity. Harald 


#128
May1611, 12:04 PM

P: 68

Your thrusters do not change your net momentum, since they only produce angular acceleration (you do lose rest mass however). 


#129
May1711, 07:49 AM

P: 261

But can you determine absolute rotation? The further away you go on a merrygoaround the harder it tries to throw you out. If the universe is spinning around a center, can we absolutely determine by how much?



#130
May1711, 12:30 PM

Mentor
P: 17,308




#131
May1711, 12:37 PM

P: 68

If you are within some sort of rotating structure, you will experience centripetal force if you appear to be stationary with the structure, and you will observe coriolis motion of objects moving relative to the structure; otherwise the interior structure will be moving with respect to you in a circle ... and yes these would be measurable absolute effects. 


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