Baliani, Giovanni Battista, De motu naturali gravium solidorum, 1638

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              <s id="s.000170">PROPOSITIO XIII. PROBL. VI.
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                <s id="s.000171">Reperire inclinationem plani, super quo grave movea-
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                tur tali velocitate quae cum alia super diversa incli-
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                natione sit in ratione data.
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              <s id="s.000172">Moveatur grave A super recta AB, seu perpendicula-
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              ri, seu inclinata, & data sit proportio C ad D.
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              <s id="s.000173">Oportet reperire aliud planum inclinatum, ita ut velocitas
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              gravis moti super AB ad velocitatem alterius moti
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              super illo reperiendo, sit ut D ad C.
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              <s id="s.000174">Producatur BA; & fiat ut C ad D ita BA, ad AE; &
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              centro A, intervallo AE describatur circulus, secans BF
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              in F; ni secet, problema insolubile est; si secat, ducatur
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              AF, quam dico esse planum quaesitum.
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              <s id="s.000175">Quoniam ut C ad D, ita AB ad AE, seu AF per constructio-
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              nem, erit C velocitas super AF, & D super AB
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              , unde velo-
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              citates super ipsis sunt in ratione data. </s>
              <s id="s.000176">Quod faciendum fuit.
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              Per 12.
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              hujus.
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