A Treatise on Physics: Dynamics and properties of matter, Volume 1

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J. & A. Churchill, 1901 - 688 páginas
 

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Página 106 - Every body continues in its state of rest, or of uniform motion in a straight line, except in so far as it may be compelled to change that state by forces impressed upon it.
Página 497 - Newton's Discovery of Law of Universal Gravitation. — Newton was in possession of the theory of elliptic motion a considerable time before he was in a position to announce his discovery of universal gravity. This he arrived at by showing that the acceleration of the moon towards the earth was to the acceleration of a falling body at the earth's surface in the inverse ratio of the square of the distance of the moon to the square of the earth's radius. This, on the assumption, afterwards justified,...
Página 4 - Hi), that the new unit of length should be based on the earth's dimensions, and it was defined as one ten-millionth part of the distance from the Equator to the North Pole along the meridian passing through Paris.
Página 401 - ... included air: and continuing this pouring in of quicksilver till the air in the shorter leg was by condensation reduced to take up but half the space it possessed (I say, possessed, not filled) before; we cast our eyes upon the longer leg of the glass...
Página 523 - In 1887 the project was enlarged to provide for the construction of two breakwaters — one on the north, the other on the south side of the...
Página 497 - ... every particle of matter attracts every other particle with a force proportional to the product of the masses, and inversely proportional to the square of the distance between them.
Página 401 - ... horizontal line in the other; we took care by frequently inclining the tube, so that the air might freely pass from one leg into the other by the sides of the mercury...
Página 255 - It is shown at § 1 15 above, that if a body be free to move as a nut upon a fixed screw-shaft it has one degree of freedom ; that this is the case is evident from the fact that the angle through which the nut is turned, and the distance through which the centroid of the nut moves parallel to the axis of the screw, are connected by an invariable relation, so that a motion of this kind involves change of only one independent variable. If...
Página 492 - ... in a parabola is obtained if the comet's original orbit actually intersects the planet's orbit at an angle of 45°, and if the comet is due first at the point of intersection, at the instant when the planet's distance therefrom is equal to the planet's distance from the sun multiplied by the ratio of the mass of the planet to the mass of the sun.
Página 401 - ... (we took, I say, care) that the air at last included in the shorter cylinder should be of the same laxity with the rest of the air about it. This done, we began to pour quicksilver into the longer leg of the siphon, which by its weight pressing up that in the shorter leg, did by degrees...

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