From: petemarlowesmith@gmail.com   
      
   On Monday, June 17, 2019 at 3:31:44 PM UTC-4, PengKuan Em wrote:   
   > Relativistic length contraction is theoretically predicted but not directly   
   > tested, which lead to incorrect interpretation of the theory illustrated by   
   > Bell's spaceship paradox and Ehrenfest paradox. But these paradoxes can help   
   > us designing experiments to test length contraction.   
   >   
   > Ideal direct experimental proof should contain the following steps:   
   > 1.	Measure the tested object's length at rest, the value l0.   
   > 2.	Put this object in motion.   
   > 3.	Measure the object's speed, the value v.   
   > 4.	Measure the object's length in motion, the value l.   
   > 5.	Check if these 3 values verify length contraction law.   
   >   
   > For doing this experiment, the difference of length l0 ï=80- l should be   
   > in measurable range. If the object is a chunk of matter, l0 ï=80- l is   
   > not measurable. For example, matter objects with the highest speed we   
   > can make are satellites, whose speed is generally 7.8 km/s. If a   
   > satellite is made of a string of 100 km long, the value of l0 ï=80- l   
   > would be 0.03 mm, which is absolutely not measurable from the ground.   
   > This is why contraction of length has never been measured.   
   >   
   > Below I propose two experiments inspired from Bell's spaceship paradox   
   > and Ehrenfest paradox.   
   >   
   > Please read the article at   
   > PDF: How to test length contraction by experiment? https://pen   
   kuanonphysics.blogspot.com/2019/06/how-to-test-length-contraction-by.html   
   > or   
   > Word: https://www.academia.edu/39584663/How_to_test_length_con   
   raction_by_experiment   
      
   There is no material length contraction. A meter stick will return the   
   same length after a journey. What the LT length contraction mean: The   
   light-path-length (LPL) of a moving meter stick is predicted to be   
   contracted by a factor of 1/gamma. This prediction by the observer is   
   based on the assumption that the LPL of the observer’s meter stick is   
   its material length.   
      
   --- SoupGate-Win32 v1.05   
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