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Multi-frequency radio observations of the radio bridge of powerful classicaldouble radio sources can be used to determine: the beam power of the jetsemanating from the AGN; the total time the source will actively produce jetsthat power large-scale radio emission; the thermal pressure of the medium inthe vicinity of the radio source; and the total mass, including dark matter, ofthe galaxy or cluster of galaxies traced by the ambient gas that surrounds theradio source. The theoretical constructs that allow a determination of each ofthese quantities using radio observations are presented and discussed.Empirical determinations of each of these quantities are obtained and analyzed.A sample of 14 radio galaxies and 8 radio loud quasars with redshifts betweenzero and two for which there is enough radio information to be able todetermine the physical parameters listed above was studied in detail.(abridged)Comment: Submitted to ApJ, LaTex, 26 total pages of text which includes  captions & two tables, plus 13 EPS figures & 1 tabl

Empirical Determinations of Key Physical Parameters Related to Classical Double Radio Sources