("7) — 

 •rcm (^f.) ~ r^ fm. L — l'^ cof. '-. Altcram vero 

 (in =z K (i — cof. -L) — i: / fin. i-, 



^Jt^ ^ r '' r r ' • • 



quae ergo hoc cafu cuadcnt 



(lf) = - '--"^-^' -f-t.ffin.Jf 

 (2;=)r=--'-fin. .f/-4-,'.rcor.if, • '* 



quac caCu / ~ o, c]uo fit fin. s t ~ s t ct cof. .r / — i — ^^ , 

 crunt(^*)=: — i j^ t - o ct (i^) ~l s s., vnde parer, quo hic 



cafus locum habcrc qucat, initio fingulis fili pundis Y in di- 

 recftrone YQ ciu^modi cclcritatcs imprimi debcrc, quae finC 

 quadrato arcus H Y =i r proportionalcs. Tum vcro ipro ini- 

 tio \iribus opus cffc infinicis, quae dciuccps in rutionc tripli- 

 cuta tcmporis dccrclccnt. 



Problema II. 



§. 2 8. Defuiire vires normiihs II, ad tuotum fupra de^ 

 fcriptum in filo producnidutn requifiias. 



S o 1 u t i o . 



Hic igitur eflc dcbct — o, vndc colligimus: 

 T' — "-'i fin. i- — LJ , 



vnde dcducimus integrando : 



T — — ^C cof. -i — llll -h /": ?, 



"S r 4gr ' -' ' 



quo valorc Aibflituto rcperitur vis normalis quaefita 



n rr — '■.: (i - 2 cof. L\ _}- (l!l±_»rlr:) ss-\f:t. 



vndc pro tcrmino fili E fiet H z= -+- ^ — \{\t ct tcnfio 



P 3 Excm- 



