Gravesande, Willem Jacob 's
,
Physices elementa mathematica, experimentis confirmata sive introductio ad philosophiam Newtonianam; Tom. 1
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MATHEMATICA. LIB. I. CAP. IX.
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tur; </
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<
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">deſcendet centrum gravitatis, dum corpus juxta pla-
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num adſcendit, poſita juſta plani inclinatione.</
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<
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<
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xml:space
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">Aſcendit corpus dum rotatur partem plani ſuperiorem
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verſus; </
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<
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xml:space
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">ſed dum ſicrotatur cavendum eſt, ne juxta planum
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labatur, ad quod requiritur funis, quo pro parte cylindrus
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circumdatur, cujus extremitas una cylindro in f connecti-
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tur, extremitate alterâ in d plano affixâ manente.</
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<
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xml:space
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">Ulterius ex iis, quæ de centro gravitatis dicta ſunt, de-
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ducitur; </
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<
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">Punctum in quocunque corpore, aut machina, quod
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xlink:label
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xml:space
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">153.</
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ſuſtinet centrum gravitatis alicujus ponderis, totum pondus
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ſuſtinere: </
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<
s
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xml:space
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">totamque vim, qua corpus terram verſus tendit,
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in hoc centro quaſi coactam dari.</
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<
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13.</
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">Si corpus A B, cujus centrum gravitatis brachio libræ
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imponitur, aliquo in ſitu æquiponderat cum pondere P,
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">TAB. IV.
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fig. 7.</
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in omni alio ſitu, ab, ab, manente centro gravitatis C,
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æquiponderabit.</
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<
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<
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">Ad perfectionem libræ requiruntur 1. </
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xml:space
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ſionis lancium, aut ponderum, ſint exactè in eadem linea
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cum centro libræ; </
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">ut ab utraque parte exactè ab iſto
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centro æqualiter diſtent; </
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modè fieri poteſt, ſint longa; </
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">ut in motu jugi & </
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<
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quantum fieri poteſt, parvus ſit attritus; </
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gravitatis jugi ponatur paululum infra centrum motus; </
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</
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<
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xml:space
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">tandem ut partes axis, quæ jugo ſeparantur, ſint exa-
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ctiſſimè in eadem linea recta, quæ ſitum maximè commo-
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dum habebit, ſi cum jugo angulum efficiat rectum.</
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">Centrum gravitatis diximus eſſe punctum in corpore, circa quod omnes
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partes ipſius, in quocunque ſitu poſiti, ſunt in æquilibrio: </
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<
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in corpore quocunque revera dari, cum pleriſque Mechanicis poſuimus, hoc
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nunc demonſtrabimus.</
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<
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">B, inæqualem quamcunque gravitatem haben-
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<
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tia; </
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<
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">TAB. VIII.
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fig. 1.</
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hac punctum C tale, ut CA ſit ad CB, ut pondus puncti B ad pondus pun-
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cti A. </
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