History and Root of the Principle of the Conservation of Energy |
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485 DATE DUE acceleration ball body C.2 History centre of gravity chemical elements chiodo conception connexion conservation conservation of energy continual variation d'Alembert's principle DATE DUE TIMOSHENKO descent determined distances DUE TIMOSHENKO COLLECTION electricity energy equal masses equations equilibrium example excluded perpetual motion experience expressed fact filo forces function Galileo Hertz ibid imagine inclined plane investigator of nature l'arco Lagrange law of causality law of inertia law of sufficient Leipzig Ludwig Boltzmann Mach Mach's Math matter means mécanique mechanical view Mechanik Ostwald's Klassiker Petzoldt physicist physics positions princi Stanford University principle of excluded principle of virtual quantity of heat rotation scientific space spatial Stallo STANFORD UNIVERSITY LIBRARIES Stevinus theorem of excluded theory of heat things thinkable tion torsion balance translation Ueber uniqueness virtual velocities vis viva viva W. K. Clifford Wärmelehre weights
Popular passages
Page 82 - Actioni contrariam semper et aequalem esse reactionem: sive corporum duorum actiones in se mutuo semper esse aequales et in partes contrarias dirigi," the "actio" is again a pressure, or the principle is quite unintelligible unless we
Page 98 - The difference between one event and another does not depend on the mere difference of the times or the places at which they occur, but only on differences in the nature, configuration, or motion of the bodies concerned.
Page 27 - Constat jam, quod mobile ex quiete in A descendens per AB, gradus acquirit velocitatis juxta temporis ipsius incrementum: gradum vero in B esse maximum acquisitorum, et suapte natura immutabiliter impressum, sublatis scilicet causis accelerationis novae, aut retardationis: accelerationis inquam, si adhuc super extenso piano ulterius progrederetur; retardationis vero, dum super planum acclive BC fit reflexio: in
Page 29 - Si pondera quotlibet, vi gravitatis suae, moveri incipiant; non posse centrum gravitatis ex ipsis compositae altius, quam ubi incipiente motu reperiebatur, ascendere. "Ipsa vero hypothesis nostra quominus scrupulum moveat, nihil aliud sibi velle ostendemus, quam quod nemo unquam negavit, gravia nempe sursum non ferri.—Et sane, si hac eadem uti scirent novorum operum machinatores, qui motum perpetuum irrito conatu
Page 75 - Corpus omne perseverare in statu suo quiescendi vel movendi uniformiter in directum nisi quatenus a viribus impressis cogitur statum ilium mutare.
Page 57 - the phenomena themselves, can be discovered by means of the molecular theory. Only that is not so. In a complete theory, to all details of the phenomenon details of the hypothesis must correspond, and all rules for these hypothetical things must also be directly transferable to the phenomenon. But then molecules are merely a valueless image.
Page 27 - It is plain now that a movable body, starting from rest at A and descending down the inclined plane AB, acquires a velocity proportional to the increment of its time: the velocity possessed at B is the greatest of the velocities acquired, and by its nature immutably impressed,
Page 95 - and time are not here conceived as independent entities, but as forms of the dependence of the phenomena on one another. I subscribe, then, to the principle of relativity, which is also firmly upheld in my Mechanics and Warmelehre. Cf. "Zeit und Raum physikalisch betrachtet,
Page 29 - Si pendulum e pluribus ponderibus compositum, atque e quiete dimissum, partem quamcunque oscillationis integrae confecerit, atque inde porro intelligantur pondera ejus singula, relicto communi vinculo, celeritates acquisitas sursum convertere, ac quousque possunt ascendere; hoc facto centrum gravitatis ex omnibus compositae, ad eandem altitudinem reversum erit, quam ante inceptam oscillationem obtinebat.
Page 28 - excluded perpetual motion. The following important passages then occur (Hugenii, Horologium oscillatorium, pars secunda). Hypotheses: If gravity did not exist, nor the atmosphere obstruct the motions of bodies, a body would keep up forever the motion once impressed upon it, with equable velocity, in a straight line.