Example: air traffic controller
Answer - Open Yale Courses
3. The spacetime interval (¢s)2 = (c¢t)2 ¡ (¢x)2 between two events is the same in every frame. 4. Energy and momentum are always conserved, and we can make e–cient use of this fact by writing them together in an energy-momentum vector P = (E=c;p) with the property P2 = m2c2. In particular, if the mass is zero then P2 = 0. 1.
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