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Electromagnetically induced acoustic noise (and vibration), electromagnetically excited acoustic noise, or more commonly known as coil whine, is audible sound directly produced by materials vibrating under the excitation of electromagnetic forces.
Content Warning: while One Man Five Cats' video is fantastic and informative, it contains some disturbing content, including graphic descriptions of cat deaths and photos taken of the litter boxes ...
The people who do hear these sounds typically hear a faint hissing (cicada-like sound), buzzing or ringing, especially if they are otherwise in complete silence. [34] Hence, researchers who looked at the Taos Hum considered otoacoustic emissions as a possibility. [35]
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The cat (Felis catus), also referred to as the domestic cat or house cat, is a small domesticated carnivorous mammal. It is the only domesticated species of the family Felidae . Advances in archaeology and genetics have shown that the domestication of the cat occurred in the Near East around 7500 BC.
Charlie Schmidt, who made the Keyboard Cat video. Keyboard Cat is a video-based internet meme.Its original form was a video made in 1984 by Charlie Schmidt of his cat Fatso seemingly playing a musical keyboard (though manipulated by Schmidt off-camera) to a cheery tune.
Mains hum, electric hum, cycle hum, or power line hum is a sound associated with alternating current which is twice the frequency of the mains electricity.The fundamental frequency of this sound is usually double that of fundamental 50/60 Hz, i.e., 100/120 Hz, depending on the local power-line frequency.
With tangential firing the furnace is essentially the burner, consequently air and coal quantities need not be accurately proportional to the individual fuel nozzle assemblies. Turbulence produced in the furnace cavity is sufficient to combine all the fuel and air.