It may be doable but not at the power levels we use in car audio. The hair tricks you mentioned I assume are attributed to the air being oscillated in a confined space. If there was no cabin, I doubt the soundwaves would be able to suspend anything heavier than smoke. I think this would be because bass waves are too far apart. To be able to excite the air enough to trap an object between waves would probably require the power of a fusion reactor. In the posted video they stated the frequency used was beyond human hearing. That would mean the waves are so close to each other that it is easier to excite and trap molecules between them, and those molecules can hold those styrofoam balls in place. They looked like styrofoam balls.
But I do have a theory involving sound. Resonant frequency. As you may know, most if not all matter has a resonant frequency. What if causing an object to resonate to it's maximum capacity will make it easy to push in any direction. Remember the old reels of the Tacoma Narrows Bridge in Washington? It is speculated that the wind blowing through it caused a sound that met the resonant frequency of the bridge causing it to begin swaying until it's collapse. It was not due to the power of the wind for it was at 35 MPH.
Yeah. I think it's all one and the same. I'm just giving examples, but you can extrapolate it out, like, sound IS size, it is geometric shape, or say frequencies of waves are that. Waves seem to define the existence of everything, so there has to be relevant wavelengths and power levels to everything that exists. What is holding the galaxy together from flinging itself apart but keeping it also from folding into itself? Seems like waves are involved. Those would be really large waves, I would think. Epically large.
I think on the resonance front, you have molecular and atomic resonances, especially molecular resonances in lattice crystals due to the repeating structures. I argue that everything has resonance, because resonance is based on size and density, wave speeds, whatever object the wave tries to travel through. Atoms are or can be defined by certain spectrums of light they emit naturally, which would seem to indicate a somewhat permanent state of resonance patterns at those light frequencies.
That bridge- resonance stores energy inside of whatever is resonating, that's why it collapsed is the bridge didn't have support where the wave structures were peaking, you can see it in the vid, so the wave amplitude was so high it broke the bridge. It changed bridge design somewhat, from what I understand, but I'm def not expert. Lol, it's the same reason you have to brace and deaden your doors and panels and what not so you don't resonate them off the side of you car. Aircraft have similar wind resonance issues, as well. Many things do. There's some good sound lessons in bridges and aircraft, when it comes to air and waves.
Quick edit
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"You’ve probably heard of resonance. This is the phenomenon where a periodic force syncs up with the natural frequency of a system. The classic example is a swing. With resonance, small periodic driving forces, like pushing someone in a swing, can add up to large oscillations over time because the energy is stored."
One of the most fundamental jobs of an engineer is to compare loading conditions to strengths. If the loads exceed the strengths, you know you’ve got a problem. Buildings and other structures face a huge variety of loads, including floods, snow, rain, ice, earthquakes, and crowds of people. One of t
practical.engineering
I'm not an expert, but that's one of the bridges. It still seems like resonance was involved, given the nature of it all.