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  1. El heavy metal, o simplemente metal (pronunciado en ocasiones como métal) [1] [2] [3] —en español traducido literalmente como «metal pesado»—, es un género musical que nació a finales de los años sesenta y principios de los setenta tanto en el Reino Unido como en los Estados Unidos, cuyos orígenes provienen del blues rock, hard rock y del rock psicodélico.

  2. where is the charge of the point source, is retarded time or the time at which the source's contribution of the electric field originated, () is the position vector of the particle, (,) is a unit vector pointing from charged particle to the point in space, () is the velocity of the particle divided by the speed of light, and () is the ...

  3. Twisted Sister was an American heavy metal band originally from Ho-Ho-Kus, New Jersey, and later based on Long Island, New York. Their best-known songs include "We're Not Gonna Take It" and "I Wanna Rock", both of which were associated with music videos noted for their sense of slapstick humor.

  4. › wiki › WavelengthWavelength - Wikipedia

    In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats. It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, troughs, or zero crossings, and is a characteristic of both traveling waves and standing waves, as well as other spatial wave patterns.

  5. Heavy metal (or simply metal) is a genre of rock music that developed in the late 1960s and early 1970s, largely in the United Kingdom and United States. With roots in blues rock, psychedelic rock and acid rock, heavy metal bands developed a thick, monumental sound characterized by distorted guitars, extended guitar solos, emphatic beats and loudness.

  6. Geothermal energy is the thermal energy in the Earth's crust which originates from the formation of the planet and from radioactive decay of materials in currently uncertain but possibly roughly equal proportions.

  7. A tachogenerator is an electromechanical device which produces an output voltage proportional to its shaft speed. It may be used for a speed indicator or in a feedback speed control system. Tachogenerators are frequently used to power tachometers to measure the speeds of electric motors, engines, and the equipment they power. Generators ...

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