CHapter 9

# CHapter 9 - agree Time Dilation For any stationary...

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CHAPTER 9 Frame of Reference – the point of view from which we observe motion Einstein’s first principle of relativity – the laws of physics that describe changing circumstances are the same for all inertial frames of reference Centripetal Force – inward force Einstein’s Second principle of Relativity – the speed of light, c , has the same fixed value 3 × 108ms for all observers. Ether – highly elastic so light could pass through it at great speeds but of low density so it wouldn’t impede the motion of planets – it was thought to be the universal medium or frame of reference. Interferometer – sensitive light measuring apparatus Null Result – the “unsuccessful” experiment is as good as a “successful” one Simultaneity – if any two observers are moving with respect to one another, then their judgment of simultaneous events may not
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Unformatted text preview: agree Time Dilation For any stationary observer. Moving clocks appear to run slower than they do for someone moving with the clock. For the moving observer, it is the clock of the stationary person that appears to be running slower. The moving and stationary observers each believe that the others clock is the one that is running slow. Paradox statement of situation that seems to be contradictory to popular belief but which is true =-t to1 v2c2 = to is the time measured by the moving observer = ( ) t relativistic time measured by observer =-L Lo1 v2c2 = Lo rest length or the normal length of the object = ( ) L relativistic length measured by observer =-m mo1 v2c2 = mo rest mass = m relativistic mass = E mc2...
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