at what sort of speed ratio (v/c) would one consider relativistic effects to become important? i would probably say when v/c ~ 0.4 as this would make the gamma factor to be ~ 1.1, making a 10% difference (for length contraction, time dilation etc..). is there any "offical" value for where one should begin to consider the effects?(adsbygoogle = window.adsbygoogle || []).push({});

thanks

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# Very quick simple question

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