The ABC of Relativity, by Bertrand Russell, Part 3
Boring Books for Bedtime Readings to Help You Sleep
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Measuring Lengths and Distances in Motion
This chapter discusses the concept of measuring lengths and distances when a body is in motion relative to the observer. It explains the use of a figure to illustrate the state of affairs and introduces the ratio of the velocity of light to the velocity of the body. The chapter also explores how apparent lengths are altered by motion, the reciprocal nature of the observations made by two observers, and the relationship between time and distance when measuring objects in motion.
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