Everyone knows the sound you hear when you slide your finger over a glass of wine. How was it created? How do you break glasses using only your voice?
Contrary to popular belief, it is almost impossible. There are especially delicate wine glasses that if you move your finger over them in a circle and the finger is wet you hear a sound that gets louder and louder. This sound is the sound operating at the resonance frequency of this particular glass. What is resonance? In physics, resonance - taken from Wikipedia - (resonance in Hebrew) "is the tendency of a system to perform oscillations (oscillations) with a maximum amplitude at a certain frequency. This frequency is called the natural frequency, or the natural frequency, of that specific object". An example of resonance is the luxury building "Versailles" which collapsed under the wedding party. The dancers stomped on the floor with great force and at a certain speed. It would be more correct to say at a certain bending frequency, and it was their misfortune that this frequency was the same or very close to the self-frequency of the floor (we will not go into the definitions of self-frequency for shells and thin panels like a floor). The floor did not collapse due to a standard load. The "Versailles" halls met the standard of the maximum permissible load of 2000 kg per meter for event halls. This load is a static load, as opposed to a dynamic load applied in the case of "Versailles". The floor began to take the form of a wave (with a fixed wavelength) and when the vibrations continued at this frequency the amplitude, that is, the height of the rise and fall of the floor, began to increase, the floor gave in and the rest is history. It should be noted that taking down security pillars (the pillars that are stuck right in the middle of our apartment) should disrupt the formation of this phenomenon (and give strength to the collapse). So why did the glass break? The glass, like anything that breaks, can withstand a certain dynamic load. The stress placed by the sound of a shout does not tickle the cup. Even if a Golani company at the end of a journey screams insults at Hezbollah seventy times at a distance of 10 cm from a glass, the glass will smile and not break. The point is to raise the voice to a very high, very precise and specific frequency, and the main thing is not to deviate from it for a long time. After a long search on the Internet I found evidence of opera singers who know how to maintain a well-tuned voice for a long time. One of them was observed breaking a wine glass, and according to those present, the glass turned into a cone for a few seconds before breaking! I wouldn't sign it, but a sound machine will definitely cause interesting effects in thin glass, since glass has an amorphous structure. Materials with an amorphous structure have the ability to deform (so they can be easily inflated) without breaking. It is known about a bridge in the USA, that winds brought it to a semi-circular structure without breaking, at least for a period of several hours. The bridge behaved as if it was made of rubber. Dozens of scientists came to watch the spectacular spectacle, which was later used for a better understanding of plate collapse in a state of resonance.
6 תגובות
A tragic disaster like no other...
What a disaster it was
Answer to the facility:
I answered you in the article with the microwave. You will come to your satisfaction.
The suspension bridge did collapse after a few hours since they learned to make supports inside the bridge itself along its entire length
And the Versailles Palace had a water leak under the floor
And the sand was soaked in water, which increased the load
You can bring (it seems to me) as a better example the microwave, which heats the water with the same frequency as that of the water molecules.
Correction: instead of "that you took down security pillars..." it should have been written "that you left security pillars".