Introduction
Last Time: Time Dilation, Space Contraction, Speed Limit, “Paradoxes”
- Moving Clocks run slow
- Moving objects shrink along the line of motion
- Events in different places can happen in different order to different observers
- Simultaneity and the “garage paradox” – not really a paradox
- Something different happens in the “twin paradox”
- Real world: supports conclusion of “twin paradox”
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Today: Mass is Energy, Energy is Mass
- Recall: Existence of speed limit from principle of relativity
- Enforcement of speed limit (relativistic mass)
- Mass is energy ( E = mc2)
- Einstein’s own words: http://www.aip.org/history/einstein/voice1.htm