Saturday, April 9, 2011

Fundamentals of Physics Extended, 8th Edition

Format : PDF
Author :  World Physics
Publisher : Springer
Size :  27 Mb

For thousands of years the spinning Earth provided a natural standard for our measurements of time. However, since 1972 we have added more than 20 “leap seconds” to our clocks to keep them synchronized to the Earth. Why are such adjustments needed? What does it take to be a good standard?

                                                                                        (Don Mason/The Stock Market and NASA)

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