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Prozorov_34 - PHYSICS 222 Introduction to Classical Physics...

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PHYSICS 222 Introduction to Classical Physics II Prof. Ruslan Prozorov Iowa State University Fall 2011 LECTURES 34 Relativity
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relativity theories Special relativity - formulated by Albert Einstein in 1905 based on works of Henri Poincaré and Hendrik Lorentz o is the physical theory of measurement in an inertial frame of reference General relativity - Einstein's theory of gravitation o the geometric theory of gravitation published by Albert Einstein in 1916. 14 November 2011 PHYS222 - Lecture 34 - Prof. Ruslan Prozorov - Iowa State University 2
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The Twin Paradox 14 November 2011 PHYS222 - Lecture 34 - Prof. Ruslan Prozorov - Iowa State University 3 One of the twin sisters travels 3 light years from Earth at a speed of 0.6c and returns back home to see her twin sister. On Earth, 1o years have passed, whereas the travelling twin calendar only showed 8 years. How can this be?
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The Ladder Paradox 14 November 2011 PHYS222 - Lecture 34 - Prof. Ruslan Prozorov - Iowa State University 4 let a long ladder fly lengthwise at great velocity past a normal garage. The proper length of the ladder is more than the length of the garage. Due to the length contraction of special relativity, the passing ladder can for an instant (or two) fit into the garage, as observed by the garage owner. However, for an observer riding on the ladder, it is the garage that moves at high speed and is length contracted. For the ladder observer there is no way that the ladder can fit into the garage, even for the briefest of moments. Hence, the whole idea seems paradoxical. http://en.wikipedia.org/wiki/Ladder_paradox
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