Bošković, Ruđer Josip
,
Theoria philosophiae naturalis redacta ad unicam legem virium in natura existentium
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continua, uti fit in curvis continuis, ea ſumma evaneſcit, & </
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nulla fit velocitatis amiſſio ex inflexione continua orta, ſed
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vis perpetua, quæ tantummodo ad habendam curvaturam re-
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quiritur perpendicularis ipſi curvæ, nihil turbat velocitatem,
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quam parit vis tangentialis, ſi qua eſt, quæ motum perpetuo
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acceleret, vel retardet; </
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<
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">ac in curvilineis motibus quibuſcunque,
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qui habeantur per quaſcunnque directiones virium, ſemper re-
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ſolvi poteſt vis illa, quæ agit, in duas, alteram perpendicu-
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larem curvæ, alteram ſecundum directionem tangentis, & </
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tus in curva per hanc tangentialem vim augebitur, vel retar-
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dabitur eodem modo, quo ſi eædem vires agerent, & </
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<
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haberetur in eadem recta linea conſtanter. </
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<
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Theoriæ communia ſunt cum Theoria vulgari.</
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<
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">Theoremata
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pro vi accele-
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rante deſcen-
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ſum, vel re-
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tardante aſcen-
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ſum in planis
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inclinatis, &
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pendulis.</
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tis abſolutæ BO ad vim BI, quæ obliquum deſcenſum acce-
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lerat, vel aſcenſum retardat, quæ eſt, ut radius ad ſinum an-
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guli BOI, vel OBR, ſive coſinum OBI. </
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<
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eſt is in fig. </
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<
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">44, quem continet directio BI, quæ eſt eadem,
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ac directio plani CD, cum linea verticali BO, adeoque an-
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gulus OBR eſt æqualis inclinationi plani ad horizontem, & </
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45.</
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angulus idem OBR in fig. </
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ticali BO recta CB jungens punctum oſcillans cum puncto
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ſuſpenſionis. </
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<
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">Quare habentur hæc theoremata: </
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">Vis accelerans
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deſcenſum, vel retardans aſcenſum in planis inclinatis, vel ubi
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oſcillatio jit in arcu circulari, eſt ad gravitatem abſolutam, ibi
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quidem ut ſinus inclinationis ipſius plani, hic vero ut ſinus anguli,
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quem cum verticali linea continet recta jungens punctum oſcillans
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cum puncto ſuſpenſionis, ad radium. </
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<
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">E quorum theorematum
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priore fluunt omnia, quæ Galilæus tradidit de deſcenſu per pla-
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na inclinata; </
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<
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">ac e poſteriore omnia, quæ pertinent ad oſcilla-
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tiones in circulo; </
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<
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">quin immo etiam ad oſcillationes factas in
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curvis quibuſcunque pondere per filum ſuſpenſo, & </
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lutis applicato; </
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<
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oſcillationis.</
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<
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">Applicatio
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Theoriæ ad re-
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fractionem: tres
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caſus velocita.
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tis normalis ex-
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tinctæ, imminu-
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tæ, auctæ.</
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tuum refractionem, ubi continentur elementa mechanica pro
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refractione luminis, & </
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<
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">occurrit elegantiſſimum theorema a
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Newtono inventum huc pertinens. </
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<
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perficies AB, CD parallelæ inter ſe, & </
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<
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piam extra illa plana nullam ſentiat vim, inter ipſa vero urgea-
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tur viribus quibuſcunque, quæ tamen & </
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<
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ctionem perpendicularem ad ipſa plana, & </
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ab altero ex iis æquales ſint ubique; </
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terum ex iis, ut AB, directione quacunque GE. </
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<
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ſum feretur motu rectilineo, & </
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</
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<
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">ejus velocitatem exprimat EH, quæ erecta ER, perpendicu-
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lari ad AB, reſolvi poterit in duas, alteram perpendicularem
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ES, alteram parallelam HS. </
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<
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