By Isaac Asimov
¿Cuál es los angeles edad del Universo? ¿Hay vida más allá del sistema sun? ¿De qué están hechos los planetas? ¿Qué es l. a. luz del sol? ¿Qué es un asteroide? ¿Qué son las nebulosas? ¿Qué es el efecto Doppler? ¿Existe un centro del Universo? ¿Qué es un cometa? ¿Cómo se produjo el massive Bang? ¿Qué es un agujero negro? ¿Se mueven las galaxias? ¿Qué es una supernova? ¿Qué produjo los cráteres lunares? ¿Cuál es los angeles edad de los angeles Tierra? ¿Cuál es el origen de terremotos y volcanes? ¿Por qué sopla el viento? Sé puede agotar l. a. energía? Qué son las mareas? ¿Cómo se formó l. a. Tierra? ¿Continuará indefinidamente los angeles expansión del Universo?
111 preguntas fundamentales de los angeles astronomía respondidas con claridad y brillantez por Isaac Asimov, maestro indiscutido de los angeles divulgación científica.
Un viaje maravilloso por l. a. astronomía: los orígenes, los enigmas, los grandes descubrimientos, los genios científicos... los angeles ciencia al alcance de todos.
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Extra info for Guía de la tierra y el espacio
Example text
When in experiments with ordinary magnets, the latter, in place of being moved past the wires, were actually made near them then a similar progressive development of the magnetic curves may be considered as having taken place, producing the effects which would have occurred by the motion of the wires in one direction; the destruction of the magnetic power corresponds to the motion of the wire in the opposite direction Faraday summarizes his final conclusion as follows : . . If a terminated wire move so as to cut a magnetic curve, a power is called into action which tends to urge an electric current through it; but this current cannot be brought into existence unless provision is made at the ends of the wire for its discharge and renewal.
In other words, the establishment of a current should act inductively on its own circuit and Faraday thus predicted, as a result of his theory, the phenomenon of self-induction. Though the immediate experiments he carried out to test this prediction t Researches in Electricity, vol. 1, p. 22. M. INDUCTION 29 yielded negative results, he succeeded in discovering the phenomenon experimentally 3 years later. In his second series of Experimental Researches in Electricity, Faraday developed an alternative view, in which he looked upon a varying current as producing moving lines of magnetic force.
It was very clearly written and in great detail, and requires little in the way of commentary. A few of the terms employed are no longer in use. "Electricity of tension" and "common electricity" refer to what is now called static electricity. The terms "electromotor" and "voltaic arrangement" mean a battery of one or more cells. The "marked pole" of a magnet is the north-seeking pole. The terms "austral" and "boreal" poles were sometimes employed, the north-seeking pole being called "austral" because it was homologous with the south pole of the earth.
Guía de la tierra y el espacio by Isaac Asimov
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