Einstein used trains for a number of relativity thought experiments since they were the fastest objects commonly
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Einstein used trains for a number of relativity thought experiments since they were the fastest objects commonly recognized in those days. Let’s consider a train moving at 0.65c along a straight track at night. Its headlight produces a beam with an angular spread of 60° according to the engineer. If you are standing alongside the track (rails are 1.5 m apart), how far from you is the train when you see its approaching headlight suddenly disappear?
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