Summary of Resonancia (Universo Mecánico 17)

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00:00:00 - 00:25:00

In this video, a student attempts to break a glass using the power of resonance. After several failed attempts, the student finally succeeds in breaking the glass. The professors agree to buy the student a new glass, and the student explains that the key to success is to find the right frequency.

  • 00:00:00 In this video, a musician plays an instrument, and explains that the sound of the instrument depends on the natural frequency of the system. This phenomenon is called resonance, and sometimes singers break glass with their voices. The committee charged with buying the musician a expensive glass of wine met and decided to do like usual and name a commission. Finally, they allocated enough money to buy the musician a very expensive glass of wine, so that he could break it in front of the audience. Before doing so, the musician wants to explain why this happens. Resonance is a physical phenomenon that occurs when a force is applied repeatedly to a system with the frequency of the system. This results in large oscillations. Some time ago, audiences saw a singer break a cup with her voice. That's what I want to show you. But first, I want to warn you that it's very difficult even though your voice is as magnificent as mine. The cup has to be made of crystal and very special, and it must be very thin and delicate to break it. And the sound has to be pure, with a tone that would make a tapping sound like a pin, and it has to be heard clearly. So before doing it, I want
  • 00:05:00 In this video, a piano is shown resonating due to the natural frequency of its vibrating system. This resonance is caused by the frequency of the strings inside the piano, which is 256 pulses per second. This frequency is also in the 2 central strings of the piano. Every time the string is expelled, thousands of oscillations are produced, increasing each one's amplitude. This resonance then amplifies the sound of the piano, and can even be heard over a large distance. Pianos resonate because they are oscillating systems, and as long as the system being resonated is oscillating at the same frequency as the system emitting the resonance, there will be interference. In this case, the resonance is caused by the 2 central strings of the piano. However, real mastery of resonance occurs when begin with a system that does not produce resonance, and only apply oscillation that does not produce sound. Using this technique, a péndulo, or pendulum, can be made to oscillate at any frequency. Pianos resonate naturally because they are built to oscillate, and even if the oscillations are small, there will still be resonance. This day, a young girl is demonstrating her mastery of resonance by playing the piano using
  • 00:10:00 In the video, Resonancia (Universo Mecánico 17), a mechanical universe is described in which two simple motions, which satisfy the differential equation, combine to create the world. The world is obtained by solving an equation for the amplitude of new oscillations produced by an additional force. The amplitude of these oscillations depends on the value of the additional force and the proximity of its frequency or mega to the natural or mega-sub-zero frequency. Some key elements of resonancia are a powerful voice, excellent frequency control can make a voice of blindness shatter glass, and an oscillator with natural or mega-sub-zero frequency. When omega approaches zero, however, even though the magnitude of the force is very small, strange things can start to happen. For example, a force in low frequency added to the natural movement can produce complex oscillations. One of the important details omitted from the differential equation is of interest. That is, the world is the sum of two simple motions that satisfy the equation. In fact, the glass in a wine glass is a very viscous fluid, and it takes centuries for it to flow centuries downward in time and space to reach the bottom. The glass is so viscous that it
  • 00:15:00 According to studies conducted at the seismological laboratories at the Caltech in Pasadena, resonance may sometimes be more than just bothersome; it can be disastrous, as it can increase what is already an elemental and almost irresistible force of nature. Waves emitted during a earthquake propagate from the earthquake's epicenter in a range of frequencies that, compared to audible sound, are generally very low for frequencies of Earth's seismic tremors. Buildings between 5 and 40 stories in height are typically resonant if they are shaken at a specific frequency. Whenever a model of such a structure is shaken in a simulated earthquake, there is always one that will be affected, depending on the frequency. generally speaking, a complex structure like a building vibrates due to waves in several natural frequencies. Engineers can reduce resonant responses by designing energy isolation and absorption measures in the structure and foundation, and strictly following building codes with respect to earthquakes. A structure's ability to resist is determined by its design and cannot be easily torn down from its own foundations. Building codes are laws, and when someone believes that some laws should be violated, some structures are doomed to suffer the consequences. Sound produced by wind blowing over cables is another effect of resonance. These cables vibrate in the natural frequency
  • 00:20:00 In 1939, Theodore von Karman, an accomplished physicist and pioneer in aerodynamics, developed a theory explaining the behavior of resonant bridges, which had until then been considered a mystery. His explanation, which did not become universally accepted among engineers, is that the bridge can collapse due to wind gusts over 64 km/h. In order to test his theory, von Karman designed and built a wind tunnel at the California Institute of Technology (Caltech). This experiment proved his theory correct, and since then no large bridge has collapsed without prior testing in a wind tunnel.
  • 00:25:00 The students are testing a mechanical universe that requires the frequency of resonance of the container with the aim of vibrating enough to break. The tone was increased until the frequency was accurate, and this is where the experiment goes wrong. The students must now increase the volume to top and the container will break according to the first row of students--they bleed ears, but don't worry, we're ready. Just like they thought, they were able to do it without breaking the exquisite glass cup. That's why the professors agreed to buy me the cup; they thought I would never be able to break it. Gentlemen, until next time.

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