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From: PaperProphet	4/7/2018 2:06:03 PM
	of 136

A 747 airplane is sitting on a conveyor belt which is as long as wide as the runway. The conveyor belt is designed to exactly match the speed of the wheels, but in the opposite direction. Can the airplane take off? Answer: The airplane's jets provide the thrust to push the airplane forward and achieve lift off. The wheels just roll along and support the airplane. The best assumption is that the conveyor cannot possibly achieve it's design goal to match the wheels' speed and therefore the airplane will take off. That's probably the more correct answer. Getting more nit-picky, if the conveyor belt achieves its lofty design goal, it will speed up rapidly until the friction on the airplane's wheel bearings makes the wheels exert a force which exactly counters the thrust of the airplane. From that standpoint if the conveyor belt somehow succeeds in its design objective, it will stop the plane from taking off. On the other hand, at that very high speed, the conveyor belt itself might create enough wind to lift the airplane's wings and might allow the plane to take off, even if only briefly until the wheels slow down.

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