![]() People who subscribe to this interpretation tend to assume the people who disagree with them think airplanes are powered by their wheels.ģ. All it means is that the wheels will spin twice as fast as normal, but that won’t stop the plane from taking off. v C=v W: That is, if the axle is moving forward (relative to the ground, not the treadmill) at 5 m/s, the treadmill moves backward at 5 m/s. I haven’t seen many people subscribe to this interpretation.Ģ. This is always true if the wheels aren’t sliding, and could simply describe a treadmill with no motor. v B=v C: The belt always moves at the same speed as the bottom of the wheel. Let’s consider each one based on this diagram:ġ. Well, as I see it, there are three possible interpretations. Let’s take a look at the statement “The conveyor belt is designed to exactly match the speed of the wheels”. ![]() With that kind of force, no matter what’s happening to the treadmill and wheels, the plane is going to move forward and take off.īut there’s a problem. That is, each engine is powerful enough to launch a brachiosaurus straight up (see diagram). A 747’s engines produce a quarter of a million pounds of thrust. The conveyor belt is designed to exactly match the speed of the wheels, moving in the opposite direction. Imagine a 747 is sitting on a conveyor belt, as wide and long as a runway. This is why, for example, the airplane/treadmill problem is a banned topic on the xkcd forums (along with argument about whether 0.999… = 1). So you get two groups each condescendingly explaining basic physics and math to the other. The tricky thing is, each group thinks the other is making a very simple physics mistake. It contains a basic ambiguity, and people resolve it one of a couple different ways. The airplane/treadmill problem is similar. Moreover, he only brought it up to start an argument to act as a diversion while he seduced your mother in the other room.) ![]() (For the record, the answer to Feynman problem, which he never tells you in his book, was that the sprinkler doesn’t move at all. The nifty thing about the problem was that the answer was immediately obvious, but to some people it was immediately obvious one way and to some it was immediately obvious the other. (I blame the LHC.)įeynman used to tell a story about a simple lawn-sprinkler physics problem. Many things went wrong during davean’s heroic upgrade.
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