Practical Physics

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Ginn, 1922 - Physics - 472 pages
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Page 16 - by the 1 kg. applied at ab would be 1000 kg. Pascal's own words are as follows : " A vessel full of water is a new principle in mechanics, and a new machine for the multiplication of force to any required extent, since one man will by this means be able to move any given weight.
Page 388 - is the image of P. We learn, therefore, that the image of a point in a plane mirror lies on the perpendicular drawn from the point to the mirror and is as far back of the mirror as the point is in front of it,
Page 9 - This equation merely states the definition of density in algebraic form. 17. Distinction between density and specific gravity. The term " specific gravity " is used to denote the ratio between the weight of a body and the weight of an equal volume of water.* Thus, if a
Page 296 - induced when a straight conductor cuts magnetic lines FIG. 302. The principle of the electric motor a direction at right angles both to the direction of the field and to the direction of the current. This fact underlies the operation of all electric motors.
Page 64 - body as two forces acting simultaneously, it must be represented by the diagonal of a parallelogram the sides of which represent the two forces. Hence, conversely, if two forces are to be equivalent in their joint effect to a single force, they
Page 8 - is found to weigh 62.4 pounds, we say that in the English system the density of water is 62.4 pounds per cubic foot. In the CGS system the cubic centimeter is taken as the unit of volume and the gram as the unit of mass. Hence we say that in this system the density of water is 1 gram
Page 35 - air-tight, while the other is uncorked. As soon as the two are placed under the receiver of an air pump and the air exhausted, the water in A will pass over into B.
Page 292 - induced in a conductor by causing the latter to move through a magnetic field, while a magnet has no such influence upon a conductor which is at rest with respect to the field. This discovery, one of the most important in the history of science, was announced by the great Faraday in 1831.
Page 267 - wire, or 6.2 inches of No. 30 German-silver wire, has a resistance of about one ohm. The legal definition of the ohm is a resistance equal to that of a column of mercury 106.3 centimeters long and 1 square millimeter in cross section, at 0
Page 181 - present in the air and the amount which would be present if the air were completely saturated. This is precisely the same as the ratio between the pressure which the water vapor present in the air exerts and the pressure which it would exert if it

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