rapidity

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Related to Lorentz factor: length contraction

rap·id

 (răp′ĭd)
adj. rap·id·er, rap·id·est
Moving, acting, or occurring with great speed. See Synonyms at fast1.
n. often rapids
An extremely fast-moving part of a river, caused by a steep descent in the riverbed.

[Latin rapidus, from rapere, to seize; see rep- in Indo-European roots.]

ra·pid′i·ty (rə-pĭd′ĭ-tē), rap′id·ness (răp′ĭd-nĕs) n.
rap′id·ly adv.

ra•pid•i•ty

(rəˈpɪd ɪ ti)

also rap•id•ness

(ˈræp ɪd nɪs)

n.
a rapid state or quality; swiftness.
[1610–20; < Latin rapiditās. See rapid, -ity]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.rapidity - a rate that is rapid
pace, rate - the relative speed of progress or change; "he lived at a fast pace"; "he works at a great rate"; "the pace of events accelerated"
fleetness - rapidity of movement; "fleetness of foot"
immediateness, instancy, instantaneousness, immediacy - the quickness of action or occurrence; "the immediacy of their response"; "the instancy of modern communication"
expeditiousness, despatch, dispatch, expedition - the property of being prompt and efficient; "it was done with dispatch"
promptitude, promptness - the characteristic of doing things without delay

rapidity

rapidity

noun
Translations
سُرْعَه
rychlost
hurtighed
hraîi, snarleiki

rapidity

[rəˈpɪdɪtɪ] Nrapidez f

rapidity

[rəˈpɪdɪti] nrapidité f

rapidity

nSchnelligkeit f; (of action, movement also)Raschheit f; (of improvement, change, spread also)Rapidheit f; (of decline, rise)Steilheit f

rapidity

[rəˈpɪdɪtɪ] nrapidità

rapid

(ˈrӕpid) adjective
quick; fast. He made some rapid calculations; He looked feverish and had a rapid pulse.
ˈrapidly adverb
raˈpidity noun
ˈrapidness noun
ˈrapids noun plural
a place in a river where the water flows quickly, often having dangerous rocks in mid-stream.

rapidity

n. rapidez, velocidad.
References in periodicals archive ?
The rotational velocity can be obtained as a function of the speed of light, the Lorentz factor, and the helical g-factor:
He also claimed that variations in the line-of-sight velocity should affect the observed luminosity proportionally to the Lorentz factor of the jet's expansion, [GAMMA] = [[1 - [(V/c).sup.2]].sup.-1/2] (where V is the relative velocity between the inertial reference frames and c is the speed of light), while the apparent [[tau].sub.lag] is proportional to 1/[GAMMA].
Let A be the Lorentz transformation which relates the reference frame where the unstable moving particle is at rest, to the one with velocity v = p/(m[[gamma].sub.L]), where [[gamma].sub.L] is the corresponding relativistic Lorentz factor. Let U(A) be an unitary representation of the transformation A acting on the Hilbert space H such that |m, p> = U([LAMBDA])|m, 0> for every value of the mass parameter m in the Hamiltonian spectrum.
The inner and outer radius of the annular beam are taken as a = 0.25R and b = 0.5R; the Lorentz factor is [gamma] = 6.
Various solutions have been suggested since Einstein's (1907) and Planck's (1907) initial proposal that the a moving body should appear cooler by a Lorentz factor, [gamma] [equivalent to] 1/[square root of (1 - [w.sup.2]/[c.sup.2]]) > 1, where w is the speed of the observer relative to the object.
This behavior suggests that, in some cases, the emission may originate from a jet consisting of "nuggets" whose angular size are less than 1/[GAMMA], where [GAMMA] is the hulk Lorentz factor. Timothy W.
A better way to express such velocities is that the "Lorentz factor" of the outflying material must be between 100 and 1,000.
for |absolute value of~ v |is less than~ c, where |Gamma~ is again the Lorentz factor |(1 - |v.sup.2~/|c.sup.2~).sup.-1/2~, and k is a positive dimensionless function of v/c.(26) The minus part in the |+ or -~ signs in (7) is removed by requiring that the transformations reduce to the identity transformation in the limit v |right arrow~ 0.
The above result implies that m is the Compton's angular frequency ([gamma][m.sub.0][c.sup.2]/[??]), and [absolute value of k] is the de Broglie wave number ([gamma][m.sub.0][upsilon]/[??]), where [gamma] is the Lorentz factor [5].
where [r.sub.e] = 2.82 x [10.sup.-15] m is classical radius for electron, [[gamma].sup.e] is the Lorentz factor of electron beam, and [mathematical expression not reproducible] are horizontal and vertical proton beam sizes at IP, respectively.