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Data lege vis centripetae, invenire Medii densitatem in locis singulis, qua corpus datam Spiralem describet.
Ex vi centripeta invenienda est velocitas in locis singulis, de∣inde ex velocitatis retardatione quaerenda Medii densitas: ut in Propositione superiore.
Methodum vero tractandi haec Problemata aperui in hujus Propositione decima, & Lemmate secundo; & Lectorem in hu∣jusmodi perplexis disquisitionibus diutius detenere nolo. Ad∣denda jam sunt aliqua de viribus corporum ad progrediendum, deque densitate & resistentia Mediorum, in quibus motus hacte∣nus expositi & his affines peraguntur.