Bošković, Ruđer Josip
,
Theoria philosophiae naturalis redacta ad unicam legem virium in natura existentium
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tate non pendet, ſed ad maſſam potius pertinet. </
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<
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ejus definitionem proferam ab ipſa gravitate nihil omnino pen-
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dentem, quanquam & </
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<
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ginem duxerit; </
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<
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">tum demonſtrabo accuratiſſime, in quavis maſ-
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ſa haberi aliquod gravitatis centrum, idque unicum, quod qui-
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dem paſſim omittere ſolent, & </
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<
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">deinde ad ejus pro-
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prietatem præcipuam exponendam gradum faciam, demonſtran-
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do celeberrimum theorema a Newtono propoſitum, centrum
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gravitatis commune maſſarum, ſive mihi punctorum quotcun-
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que, & </
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<
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">utcunque diſpoſitorum, quorum ſingula moveantur ſola
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inertiæ vi motibus quibuſcunque, qui in ſingulis punctis uni-
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formes ſint, in diverſis utcunque diverſi, vel quieſcere, vel mo-
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veri uniformiter in directum: </
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<
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">tum vero mutuas actiones quaſ-
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cunque inter puncta quælibet, vel omnia ſimul, nihil omnino
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turbare centri communis gravitatis ftatum quieſcendi, vel mo-
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vendi uniformiter in directum, unde nobis & </
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<
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">actionis, ac reactio-
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nis æqualitas in maſſis quibuſque, & </
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<
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rum definientia, & </
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">alia plurima ſponte provenient. </
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diamur rem ipſam.</
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<
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tri gravitatis
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non pendens ab
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idea gravitatis:
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ejus congruen-
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tia cum idea
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communi.</
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cunque, & </
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quod ſi ducatur planum quodcunque; </
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pendicularium ab eo plano punctorum omnium jacentium ex al-
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tera ejuſdem parte, æquetur ſummæ diſtantiarum ex altera. </
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<
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quidem extenditur ad quaſcunque, & </
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<
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eorum ſingulæ punctis utique conſtant, & </
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dam punctorum diverſorum congeries. </
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brio gravium, & </
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<
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">natura vectis, de quibus agemus infra: </
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<
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">ex iis
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habetur illud, ſingula pondera ita connexa per virgas inflexiles,
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ut moveri non poſſint, niſi motu circa aliquem horizontalem
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axem, exerere ad converſionem vim proportionalem ſibi, & </
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ſtantiæ perpendiculari a plano verticali ducto per axem ipſum;
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</
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<
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">unde fit, ut ubi ejuſmodi vires, vel, ut ea vocant, momenta vi-
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rium hinc, & </
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<
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ro ipſa pondera in noſtris gravibus, in quibus gravitatem con-
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cipimus, ac etiam ad ſenſum experimur, proportionalem in ſin-
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gulis quantitati materiæ, & </
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<
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">agentem directionibus inter ſe pa-
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rallelis, proportionalia ſunt maſſis, adeoque punctorum eas con-
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ſtituentium numero; </
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<
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">quam ob rem idem eſt, ea pondera in di-
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ſtantias ducere, ac aſſumere ſummam omnium diſtantiarum o-
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mnium punctorum ab eodem plano. </
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<
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">Quod ſi igitur reſpectu
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aggregati cujuſcunque punctorum materiæ quotcunque, & </
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modocunque diſpoſitorum ſit aliquod punctum ſpatii ejuſmodi,
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ut, ducto per ipſum quovis plano, ſumma diſtantiarum ab illo
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punctorum jacentium ex parte altera æquetur ſummæ diſtantia-
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rum jacentium ex altera; </
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<
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">concipiantur autem ſingula ea pun-
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cta animata viribus æqualibus, & </
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<
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">parallelis, cujuſmodi ſunt vi-
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res, quas in noſtris gravibus concipimus; </
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<
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