Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. XXIII.
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tro ſuſpenſionis exerit nullum ibi generet motum . </
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<
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xml:space
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">Ita autem obex, in
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incurrit pendulum, diſponi poteſt ut nullam pendulum in puncto ſuſpenſi-
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onis exerat in retinaculum ſuum preſſionem. </
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<
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caſu in obicem incurrit vocatur centrum percuſſionis.
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<
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<
s
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xml:space
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">Centri hujus hæc eſt proprietas, dari æquilibrium inter actiones quibus corpora
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ab utraque parte hujus centri in pendulum agunt.</
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<
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<
s
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obex, in quem incurrit, poſitus in ipſo centro percuſſionis, & </
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<
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dari dum in hunc vectem corpora incurrunt, velocitatibus quibus in pendulo
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moventur.</
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<
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<
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xml:space
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I, centrum percuſſionis erit H, ſi poſitis, vecte cujus ſuſtentaculum eſt H,
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fig. 1.</
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& </
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<
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citatibus quas in pendulo habent, detur inter haſce actiones æquilibrium; </
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<
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enim punctum I penduli ullo motu affici non poteſt, aut ſiretineatur, ullam exe-
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rere preſſionem.</
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<
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actiones determinari debent, id eſt, ſunt hæ actiones conferendæ inter ſe.</
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<
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<
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xml:space
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<
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poris A velocitas m, & </
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<
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xml:space
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HD. </
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<
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">Eodem modo in vectem agit corpus A, utrum in A ad partem M, aut in
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L ad partem N, eadem velocitate in hunc incurrat poſitis HA & </
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<
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tari circa centrum H & </
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nuetur Hfin G, ut HG & </
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ſi velocitas puncti eſe habeat ad velocitatem puncti G, ut Ddd ad Aaa , id
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Ddd, Aaa:</
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<
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</
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<
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">unde patet actionem ſequi rationem producti maſſæ corporis per velocitatem, & </
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ſtantiam a fulcro.</
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<
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</
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<
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">& </
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<
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<
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ſequitur rationem producti corporis per ſuas diſtantias a centris ſuſpenſionis
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& </
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<
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">percuſſionis, daturque æquilibrium inter actiones ab utraque parte centri
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percuſſionis, quando producta hæc ab utraque parte hujus centri ſunt æqualia,
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quam eandem cùm centrum oſcillationis habeat proprietatem , ſequitur
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cum centro percuſſionis coincidere.
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<
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<
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">Corpora elaſtica, poſt ictum, ut jam notavimus, ſeparan-
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tur, ſed vi diverſa in circumſtantiis ſimilibus; </
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in variis corporibus elaſticitas differt.</
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