The Elements of Physics: A Text-book for High Schools and Academies

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Ginn & Company, 1898 - 381 páginas
 

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Página 217 - Why the image is seen as far behind the mirror as the object is in front of it.— Let AB be an arrow held Fig.
Página 65 - 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.
Página 63 - ... the sea, the light that comes to our eyes, the sound that strikes our ears, and the waves that carry the wireless telegraph messages across the sea are all the result of motion of this kind. The pendulum and its vibration. A pendulum consists of a weight so suspended as to move freely (Fig. 138). The distance from the point of suspension to the center of the weight is the length of the pendulum. Let us study the swinging to and fro of a pendu338 him, for in it we shall find a good example of...
Página 230 - See f/stop. focal length When the lens is focused on infinity, it is the distance from the optical center of the lens to the focal plane. focal plane The plane on which a lens forms a sharp image. Also, it may be the film plane or sensor plane.
Página 132 - The vast influence which the ocean must exert, as a moderator of climate, here suggests itself. The heat of summer is stored up in the ocean, and slowly given out during the winter. This is one cause of the absence of extremes in an island climate.
Página 372 - I do not know what I may appear to the world, but to myself I seem to have been only like a boy playing on the sea-shore, and diverting myself in now and then finding a smoother pebble or a prettier shell than ordinary, whilst the great ocean of truth lay all undiscovered before me.
Página 158 - 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.
Página 362 - ... ordinary coil ; it need not be reproduced here. But, by way of contrast, here is a form of discharge of a coil, the primary current of which is vibrating several hundred thousand times per second. The discharge of an ordinary coil appears as a simple line or band of light. The discharge of this coil appears in the form of powerful brushes and luminous streams issuing from all points of the two straight wires attached to the terminals of the secondary. (Fig. 1...
Página 160 - According to the British system, the same fact is stated as follows : The quantity of heat that will raise the temperature of 1 pound of water from 60° to 61° F.
Página 115 - The loss of weight of a body immersed in a fluid is equal to the weight of the displaced fluid, or a body immersed in a fluid is buoyed up by a force equal to the weight of the fluid displaced by it.

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