The acousic principle.
By anti-centrifugal mechanism!
yes
Sound waves can't be generated in a vacuum.
I would expect any movement of matter to cause some sound.
Yes. Your visual mechanism doesn't respond to sound waves.
The voice mechanism consists of three main parts: the lungs, which provide air for sound production, the vocal cords, which vibrate to produce sound, and the resonating chambers in the throat, mouth, and nose, which shape and amplify the sound.
I think the idea is difficult to implement but would like to know whether it can be implemented.
By plucking the string you create waves which generate vibrations all sound and music are vibrations
Yes, sound energy is considered renewable because it is produced by vibrations in the air, which can be continuously generated.
sound doesn't transmit a lot of energy, and there is no suitable source of reliable sound to even try
It can be, either the sound or the mechanism that make it. It can also be a verb to chime.
When a door is moved, if there is any "sticking"' in the hinge mechanism (or contact at the jamb), there may be a continuous "stick-and-release" action. This may result in mechanical vibration which will produce sound. Sound is the mechanical energy released through the air (and through the door, too) based on some kind of harmonic motion in the door's component parts, and stimulated by moving the door. Science explains what the sound is and how it was generated in this instance. Should we have a meter, science could allow us to measure the sound.