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Title: Brainteaser: There's an airplane on the runway..
Source: Elsewhere
URL Source: http://www.someplaceelse.com
Published: Dec 1, 2005
Author: I have no idea
Post Date: 2005-12-01 01:10:02 by Jhoffa_
Keywords: Brainteaser:, airplane, runway..
Views: 2246
Comments: 202

Imagine a plane is sat on the beginning of a massive conveyor belt/travelator type arrangement, as wide and as long as a runway, and intends to take off. The conveyer belt is designed to exactly match the speed of the wheels at any given time, moving in the opposite direction of rotation. There is no wind.

Can the plane take off?

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Begin Trace Mode for Comment # 79.

#35. To: Jhoffa_, Starwind, Zipporah (#0)

Here's another one, a bit harder.

A plane is flying and inside the plane's cabin is a fly which is flying. As we know, the wings of an aircraft are supporting the total weight of the the plane and it's contents.

So... if the fly is flying inside the plane, does the weight of the fly count in the total weight of the aircraft?

Neil McIver  posted on  2005-12-01   16:24:50 ET  Reply   Untrace   Trace   Private Reply  

Yes, it's wings are displacing air, which exert downward force on the floor of the plane.

If a shipping company charges by weight, would they have to pay you if you sent some helium?

As for the original problem, is the plane stationary or moving with the conveyor belt? It would need to reach takeoff speed relative to the ground in order to ahieve flight. Even if it's moving, the conveyor belt may be moving enough air that there is insufficient lift (relative speed of air passing over/under wing), but I doubt that would be much of a factor.

Dakmar  posted on  2005-12-01   16:32:49 ET  Reply   Untrace   Trace   Private Reply  

I doubt that would be much of a factor.

me too

wakeup  posted on  2005-12-02   1:30:02 ET  Reply   Untrace   Trace   Private Reply  

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