why when you’re driving and lower the back windows but not the front it makes that debilitating helicopter noise?
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That’s what you call an acoustic resonance or resonances. The resonances are excited by the open window. The frequencies at which it vibrates are determined not only by the air volume and shape, but also the structure of the vehicle walls surrounding the air. If your really interested in this kind of stuff, there is a whole field of mechanical engineering devoted to this, usually called NVH(noise, vibration and harshness). It is typically a masters or phd program. Imo, it is one of the most interesting and beneficial ME degrees.
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