Descartes, René, Renati Des-Cartes principia philosophiae

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                <pb pagenum="67"/>
              celeritatis & verſus eandem partem. </s>
              <s>Viſque illa debet
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              aeſtimari tum à magnitudine corporis in quo eſt, &
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              ſuperficiei ſecundúm quam iſtud corpus ab alio diſ­
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              jungitur; tum à celeritate motús, ac naturâ & con­
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              trarietate modi, quo diverſa corpora ſibi mutuò oc­
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              currunt. </s>
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            <p type="margin">
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              XLIII.
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              In quo conſiſtat vis
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              cujuſque corporis ad
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              agendum vel reſiſten­
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              dum. </s>
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              20</s>
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              25</s>
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              30</s>
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              5</s>
            </p>
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              Atque notandum eſt, unum motum alteri motui
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              aequ¬è veloci nullo modo eſſe contrarium, ſed propriè­
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              tantúm duplicem hic inveniri contrarietatem. </s>
              <s>Unam
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                <arrow.to.target n="marg491"/>
              inter motum & quietem, vel etiam inter motús celeri­
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              oppo
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              iam. </s>
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              tatem & tarditaem, quatenus ſcilicet iſta tarditas de
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              quietis naturà participat. </s>
              <s>Alteram inter determinatio­
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              nem motus verſus aliquam partem, & occurſum cor­
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              poris in illâ parte quieſcentis vel aliter moti; atque
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              pro ratione partis in quam corpus alteri occurrens
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              movetur, haec contrarietas eſt major vel minor. </s>
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              XLIV.
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              Motum non eſſe motui
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              contrarium, ſed quie­
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              ti; & determinatio­
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              nem in unam partem,
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              determinationi in
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              partem oppoſitam. </s>
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              10</s>
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              15</s>
            </p>
            <p type="main">
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              Ex quibus ut poſſimus determinare, quo pacto ſin­
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              gula corpora motus ſuos augeant vel minuant, vel in
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              minari, quanium cu­
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              alias partes convertant, ob aliorum corporum occur­
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              ſus, oportet tantúm calculo ſubducere, quantum in
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              unoquoque ſit virium, ſive ad movendum, ſive ad mo­
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              tui reſiſtendum; ac pro certo ſtatuere, illud ſemper,
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              quod valentius eſt, fortiri ſuum eſſedum. </s>
              <s>Hocque fa­
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              cilè calculo ſubduci poſſet, ſi duo tant'um corpora ſibi
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              mutuò occurrerent, eaque eſſent perfectè dura, & à
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              reliquis omnibus ſic diviſa, ut eorum motus à nullis
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              aliis circumjacentibus impedirentur nec juvarentur;
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              ea enim regulas ſequentes obſervarent a
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              francüaise des Principes, et p. 327. </s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>