It's not the Earth's circumference, but the change in air density. The speed of sound is highly dependent on air density, so the groundspeed corresponding to a given Mach number varies with altitude significantly.

That's the whole point of the patent - the lights tell the car when the optimal time to start is so that everyone can promptly begin moving again when the light actually changes.

A mass with angular momentum experiences a moment in a direction perpendicular to both the angular momentum, and the rate of change of the angular momentum. I'm not sure if I stated that correctly, I may be off, but what it means is that if the flywheel is mounted horizontally (the angular momentum vector pointed straight up or down) then when the car rolls, it will generate a pitching moment, and when the car pitches, it will generate a rolling moment. I don't know if it would be likely that the car would experience high enough pitch or roll rates for this to be a factor. A stabilizer could rotate the flywheel internally in the car pitch axis to generate a rolling moment when going around corners.

ironed

Here is a hint, right now the pollution from the manufacture and use of all of these products is embedded in the air you are breathing, and you currently have no way to avoid it.

This is merely charging people for their actual use of public property - air - which has been overused. You will be charged no extra if you only use the air you breathe.

I have no idea how the specific control laws in the A330 work, but on other aircraft there is an artificial spring force that varies with airspeed and other factors to give the pilot a good feel on the controls for the particular flight condition.

From the chart at airbusdriver, it looks like there are backup mechanical controls for the elevator and rudder only. It says the elevator control is via a trim wheel, which would only allow very slow changes, and would be really awkward to try to regain control in a difficult situation.

The software should limit the control inputs to levels that won't break the aircraft at the given flight condition, but, if say the air data unit was malfunctioning, the control laws may have thought the aircraft was moving much slower, and given the pilot greater authority to move the rudder, and led to a structural failure. This is all complete speculation, but, just a thought.

Kids have always been required to do work at school, but this one thing which is more applicable to everyday life than most school work, is a problem?

I think you are taking this a way too seriously. First, no one is forcing anyone, or even really compelling anyone to volunteer, if you don't want to do it, you don't have to, with no negative effects whatsoever.

I think the goal is just to make a time where it is more socially acceptably and when people are encouraged to do volunteer work. Many people might have a slight interest, or be unsure of how to get involved, so maybe this day will make that easier, and make them realize how to volunteer more often, out of their own free will.

The same goes for requiring some community service in school. In real life no-one can make you volunteer, but they also can't make you write papers or finish assignments. In school, you get grades for learning, and trying out some volunteer work can be educational.

The pressurized air in the cabin of a plane typically enters just after the compressor stage (but obviously before combustion) in the engines, thereby not requiring a separate compressor, and then goes through a pressure regulator (and filters, I would guess) before entering the cabin. In flight, all the air entering the engine is clean, but at startup, it's probably possible for a some exhaust from the engine, or from other ground vehicles to enter the system.

So the article is saying that older people with dimentia may not recognize sarcasm, but you appear to recognize sarcasm when it's not actually there.

Maybe this is another possible research topic?

Both of these may be able to fly as an airplane to this altitude, but would have the same problems when converting to hover. The harrier in particular has an extremly high disc loading (being a jet) and the V-22 has a higher disc loading than a traditional helicopter which decreases their hover efficiencies, and limits their ceiling more than other helicopters.

Ok it's a deal, I'll volunteer to have a death row inmate live in my guestroom, but only if you volunteer to be wrongly accused of a crime and put on death row with nothing to preserve your life.