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rapidity
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The answer RAPIDITY has 17 possible clue(s) in existing crosswords.
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The word RAPIDITY is VALID in some board games. Check RAPIDITY in word games in Scrabble, Words With Friends, see scores, anagrams etc.
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Definitions of rapidity in various dictionaries:
noun - a rate that is rapid
adv - moving or acting with great speed [ adj -IDER, -IDEST] : RAPIDLY
noun - a fast-moving part of a river
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| Possible Dictionary Clues |
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| the quality of moving or reacting with great speed. |
| a rate that is rapid |
| speed, swiftness the condition of being rapid |
| A measure of velocity relative to the speed of light |
| A measure of the velocity of a particle in a beam relative to the beams axis |
| Rapidity description |
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In relativity, rapidity is commonly used as a measure for relativistic velocity. Mathematically, rapidity can be defined as the hyperbolic angle that differentiates two frames of reference in relative motion, each frame being associated with distance and time coordinates. * For one-dimensional motion, rapidities are additive whereas velocities must be combined by Einstein's velocity-addition formula. For low speeds, rapidity and velocity are proportional, but for higher velocities, rapidity takes a larger value, the rapidity of light being infinite. * Using the inverse hyperbolic function artanh, the rapidity w corresponding to velocity v is w = artanh(v / c) where c is the velocity of light. For low speeds, w is approximately v / c. Since in relativity any velocity v is constrained to the interval c < v < c the ratio v / c satisfies 1 < v / c < 1. The inverse hyperbolic tangent has the unit interval (1, 1) for its domain and the whole real line for its range, and so the interval c < v < c |