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HAY /sci/, logic problem!

Name: Anonymous 2006-11-01 22:35

There is a giant, 10 mile long stetch of runway with a 747 on the middle of it. The runway, however, is specially designed to move, much in the same way that a treadmill will move, in the opposite direction of the plane. Secondly, the treadmill is attached to a computer which will match the acceleration of the plane exactly and constantly, in the opposite direction.

What is the result of this experiment? Does the plane ever take off?

Name: Anonymous 2006-11-02 16:49

>>15

yes......
So, what we have is a plane moving along thr runway, through that AIR at speed X, and a runway moving backwards against the AIR at a speed of X. Nowhere in the problem does it say the runway cancels out the movement of the speed, just that the runway will be moving in the opposite direction.

Since the plane recieves it's forward momentum by pushing against the AIR, not the runway, and since the wheels of a plane move freely, there is no way the runway can cancel the HUGE force of the plane engines simply by spinning the wheels faster

Go back to physics, plz

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