Richard Feynman's Fraudulent Logic

Richard Feynman: "Suppose we are riding in a car that is going at a speed u, and light from the rear is going past the car with speed c. [...] ...according to the Galilean transformation the apparent speed of the passing light, as we measure it in the car, should not be c but should be c-u. For instance, if the car is going 100,000 mi/sec, and the light is going 186,000 mi/sec, then apparently the light going past the car should go 86,000 mi/sec. In any case, by measuring the speed of the light going past the car (if the Galilean transformation is correct for light), one could determine the speed of the car. A number of experiments based on this general idea were performed to determine the velocity of the earth, but they all failed - they gave no velocity at all. [...] As mentioned above, attempts were made to determine the absolute velocity of the earth through the hypothetical “ether� that was supposed to pervade all space. The most famous of these experiments is one performed by Michelson and Morley in 1887." http://www.feynmanlectures.caltech.edu/I_15.html

The Michelson-Morley experiment "gave no velocity at all" because the principle of relativity was operative in that case - all parts of the experiment, including the emission and the detection of the light, occurred WITHIN the moving system.

In the car case the light comes "from the rear" - the experiment is not entirely performed within the moving system and the principle of relativity is irrelevant. Nothing prevents people in the car from measuring the speed of light as c-u.

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