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Introductory physics Reference Libraries

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General Relativity
2004-10-19 04:45:41

General Relativity -- General Relativity is the common name for the theory of gravitation published by Albert Einstein in 1915. According to general relativity the force of gravity is a manifestation of the local geometry of spacetime. Although the modern theory is due to Einstein, its origins go back to the axioms of Euclidean geometry and the many attempts over the centuries to prove...

Escape Velocity
2004-10-19 04:45:41

Escape Velocity -- An escape velocity is the minimum speed at which an object without propulsion can move away from a source of a gravitational field indefinitely if there is no friction. This definition may need modification for the practical problem of two or more sources in some cases. In any case, the object is assumed to be a point with a mass that is negligible compared with that of...

Word of the Day
megalophonous
  • Having a loud voice; vociferous; clamorous.
  • Of grand or imposing sound.
The word 'megalophonous' comes from Greek roots meaning 'big' and 'sound'.