Gravesande, Willem Jacob 's, Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1

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            <s xml:id="echoid-s4502" xml:space="preserve">
              <pb o="107" file="0165" n="179" rhead="MATHEMATICA. LIB. I. CAP. XXI."/>
            eo ſi hæc dicatur 2R, erit IL = {AI
              <emph style="super">q</emph>
            /2R} = {Bi
              <emph style="super">q</emph>
            /2R}:</s>
            <s xml:id="echoid-s4503" xml:space="preserve">ſed{aB
              <emph style="super">q</emph>
            /2AF} ſe habet ad {Bi
              <emph style="super">q</emph>
            /2R},
              <lb/>
            ut {
              <emph style="ol">M-N</emph>
              <emph style="super">q</emph>
            /AF} ad{N
              <emph style="super">q</emph>
            /R}; </s>
            <s xml:id="echoid-s4504" xml:space="preserve">idcirco
              <lb/>
            IL, AB:</s>
            <s xml:id="echoid-s4505" xml:space="preserve">: {N
              <emph style="super">q</emph>
            /R} {
              <emph style="ol">M-N</emph>
              <emph style="super">q</emph>
            /AF}</s>
          </p>
          <p>
            <s xml:id="echoid-s4506" xml:space="preserve">Sed ut vidimus AB, I i:</s>
            <s xml:id="echoid-s4507" xml:space="preserve">: M-N, M + N; </s>
            <s xml:id="echoid-s4508" xml:space="preserve">ergo ex compoſitione rationis
              <lb/>
            IL, I i:</s>
            <s xml:id="echoid-s4509" xml:space="preserve">: {N
              <emph style="super">q</emph>
            x
              <emph style="ol">M-N</emph>
            /R}, {
              <emph style="ol">M-N</emph>
              <emph style="super">q</emph>
            x
              <emph style="ol">M + N</emph>
            /AF} = {
              <emph style="ol">M
                <emph style="super">q</emph>
              -N
                <emph style="super">q</emph>
              </emph>
            x
              <emph style="ol">M-N</emph>
            /AF} :</s>
            <s xml:id="echoid-s4510" xml:space="preserve">: {N
              <emph style="super">q</emph>
            /R}, {M
              <emph style="super">q</emph>
            -N
              <emph style="super">q</emph>
            /AF}
              <lb/>
            Eodem tempore percurruntur IL & </s>
            <s xml:id="echoid-s4511" xml:space="preserve">i I, prima vi qua corpus retinetur in
              <lb/>
            Ellipſi quieſcente, ſecunda difterentiâ vis hujus cum vi qua corpus in El-
              <lb/>
            lipſi mobili retinetur, ergo vis in Ellipſi ad differentiam hanc, ut {N
              <emph style="super">q</emph>
            /R}
              <lb/>
            ad {M
              <emph style="super">q</emph>
            -N
              <emph style="super">q</emph>
            /AF} .</s>
            <s xml:id="echoid-s4512" xml:space="preserve"/>
          </p>
          <note symbol="*" position="right" xml:space="preserve">401.</note>
          <p>
            <s xml:id="echoid-s4513" xml:space="preserve">Dicatur {N
              <emph style="super">q</emph>
            /AF
              <emph style="super">q</emph>
            } vis qua corpus in Ellipſi retinetur in puncto A, & </s>
            <s xml:id="echoid-s4514" xml:space="preserve">fiat
              <lb/>
            {N
              <emph style="super">q</emph>
            /R}, {M
              <emph style="super">q</emph>
            -N
              <emph style="super">q</emph>
            /AF} :</s>
            <s xml:id="echoid-s4515" xml:space="preserve">: {N
              <emph style="super">q</emph>
            /AF
              <emph style="super">q</emph>
            }, ad differentiam virium {RMM-RNN/AF
              <emph style="super">c</emph>
            }</s>
          </p>
          <p>
            <s xml:id="echoid-s4516" xml:space="preserve">Si agatur de diſtantia alia quæcunque quæ dicatur D, vis qua corpus reti-
              <lb/>
            netur in Ellipſi hac analogia detegitur
              <note symbol="*" position="right" xlink:label="note-0165-02" xlink:href="note-0165-02a" xml:space="preserve">381. 411.</note>
            {I/AF
              <emph style="super">q</emph>
            }, {I/D
              <emph style="super">q</emph>
            } :</s>
            <s xml:id="echoid-s4517" xml:space="preserve">: {N
              <emph style="super">q</emph>
            /AF
              <emph style="super">q</emph>
            } ad vim quæſitam {NN/DD}.</s>
            <s xml:id="echoid-s4518" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4519" xml:space="preserve">Difterentia virium detegitur hac regulâ
              <note symbol="*" position="right" xlink:label="note-0165-03" xlink:href="note-0165-03a" xml:space="preserve">410.</note>
            {I/AF
              <emph style="super">c</emph>
            }, {I/D
              <emph style="super">c</emph>
            } :</s>
            <s xml:id="echoid-s4520" xml:space="preserve">: {RMM-RNN/AF
              <emph style="super">c</emph>
            } ad differentiam quæſitam
              <lb/>
            {RMM-RNN/D
              <emph style="super">c</emph>
            }.</s>
            <s xml:id="echoid-s4521" xml:space="preserve"/>
          </p>
          <p>
            <s xml:id="echoid-s4522" xml:space="preserve">Idcirco vis integra qua corpus in Ellipſi mobili retinetur ſequitur propor-
              <lb/>
              <note position="right" xlink:label="note-0165-04" xlink:href="note-0165-04a" xml:space="preserve">427.</note>
            tionem {NN/D
              <emph style="super">q</emph>
            } + {RMM-RNN/D
              <emph style="super">c</emph>
            }, quando corpus & </s>
            <s xml:id="echoid-s4523" xml:space="preserve">Ellipſis ad eandem
              <lb/>
            partem tendunt. </s>
            <s xml:id="echoid-s4524" xml:space="preserve">Si motus hi fuerint contrarii vis proportionalis eſt
              <lb/>
            {NN/D
              <emph style="super">q</emph>
            }-{RMM - RNN/D
              <emph style="super">c</emph>
            }.</s>
            <s xml:id="echoid-s4525" xml:space="preserve"/>
          </p>
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