Introductory Course of Natural Philosophy for the Use of Schools and Academies

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A. S. Barnes, 1875 - 504 стор.
 

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Сторінка 150 - Archimedes stated that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
Сторінка 149 - A body immersed in a liquid is buoyed up by a force equal to the weight of the liquid displaced by it.
Сторінка 40 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Сторінка 219 - The heat which is expended in changing a body from the solid to the liquid state, or from the liquid to the gaseous state, is called latent heat.
Сторінка 188 - ... air and the smallness of the tube. The bulb is therefore heated, when the air within expands, and a portion escapes in bubbles through the mercury. On cooling, the pressure of the external atmosphere forces a quantity of mercury through the tube into the bulb. By repeating this operation a few times, the bulb and a portion of the tube are filled with mercury. The whole is then heated till the mercury boils, thus filling the tube, when the funnel is melted off and the tube hermetically sealed...
Сторінка 281 - When the object is between the principal focus and the mirror, the image is virtual and erect, as shown in Fig. 168. Furthermore, it is larger than the object, or magnified.
Сторінка 164 - Sounds are propagated better in calm than in stormy weather, also with more intensity in the direction of the wind than in the contrary direction. A modification of the law, that the intensity of sound varies inversely as the square of the distance, takes place when sound is caused to travel through long smooth tubes. The sound moves like the rings produced in a pool of water by a falling stone: they...
Сторінка 315 - ... will be crossed by dark lines having the same position as the bright lines belonging to the spectra of the vapors. Hence, it appears that every body in a state of vapor is opaque to the class of rays that it emits when rendered incandescent. The principle just elucidated has been applied to explain the dark
Сторінка 268 - The angle that the incident ray makes with the normal to the reflecting surface at the point of incidence, is called the angle of incidence ; thus, CD A is an angle of incidence.
Сторінка 75 - Hence, the pressure upon any layer is proportional to its depth below the iipper surface, and is equal to the weight of the column of fluid above it. In consequence of the principle of PASCAL, this pressure is transmitted laterally, and acts against the sides of the vessel with an equal intensity. Hence, every part of the surface is pressed with a force equal to the weight of a column of liquid whose base is the surface pressed, and whose height is equal to the distance from that surface to the upper...

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