The Origin and Economy of Energy in the Universe |
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absolutely action and reaction amount of energy amount of heat amount of heat-energy angle astronomers binaries body moving Book cause centre change of direction comet component conservation of energy constant density distance earth effect equal equation ergy eruptions evidence exertion explain fact finite force globe gravitation greater heat-energy developed hypothesis increase inertia infer intensity invisible Jupiter kinetic energy law of conservation light Lord Kelvin magnitude mass matter meteors microf molar motion molecular energy moon moving body mystery nature nebula nebular hypothesis Newton orbit overcome parallelogram parallelogram of forces particle perihelion perihelion passage period phenomena photosphere physical physicists planets position potential energy Primosol principle proper motion proportional proposition proved radiated reader resistance rest revolving rotation Scholium Sect space spectroscopic spectroscopic binaries spots stars substance sun's surface temperature theory thermal activities tidal tidal energy tion truth unit velocity V₁ vis viva volcanic
Popular passages
Page 24 - The total energy of any body or system of bodies is a quantity which can neither be increased nor diminished by any mutual action of such bodies, though it may be transformed into any one of the forms of which energy is susceptible.
Page 78 - An impressed force is an action exerted upon a body, in order to change its state, either of rest or of uniform motion in a right line.
Page 87 - The vis insita, or innate force of matter, is a power of resisting, by which every body, as much as in it lies, continues in its present state, whether it be of rest, or of moving uniformly forwards in a right line.
Page 132 - ... forces describes the diagonal of a parallelogram, in the same time that it would the sides with separate.
Page 88 - Matter has an innate power of resisting external influences, so that every body, as far as it can, remains at rest or moves uniformly in a straight line.
Page 321 - ... could not differ from 71° Fahr, by more than a single degree. Now, from the Bible we learn that both plants were simultaneously cultivated in the central valleys of Palestine, in the time of Moses, and its then temperature is thus definitively determined.
Page 401 - Amusements of Life. When they meet an Acquaintance in the Morning, the first Question is about the Sun's Health, how he looked at his Setting and Rising, and what Hopes they have to avoid the Stroke of the approaching Comet.
Page 239 - The quantity of heat lost or gained by a body in a second is proportional to the difference between its temperature and that of .the surrounding medium.
Page 300 - Ш) one yet knows. The spectroscope, if we interpret its indications in the usual way, tells us that a comet is simply a mass of hydrocarbon vapor, shining by its own light. But there must be something wrong in this interpretation. That the light is reflected sunlight seems to follow necessarily from the increased brilliancy of the comet as it approaches the sun and its disappearance as it passes away.
Page 24 - In any system of bodies whatever, to which no energy is communicated by external bodies, and which parts with no energy to external bodies, the sum of the various potential and kinetic energies remains for ever unaltered.