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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: 964
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 # 187.

#187. To: Jhoffa_ (#0)

You are a magician. You are going to do the old pull the tablecloth out from underneath the plates trick. Think of the tablecloth as a conveyor belt. You are a bit worried that some of those plates might choose to stick to the tablecloth and you are really looking to amaze your friends. You decide to mount little ball bearing wheels under each plate to reduce the friction.

Good job! You did it! All the plates stayed right in place during the entire pulling of the cloth and you just kept pulling. Infinitely! You thought ahead and got one heck of a long table cloth. The plates just stayed right there on the table. Well done.

How did the trick work? Well, you simply couldn't transfer any of the table cloth's (the conveyor belt) energy to the plates. There was a frictionless layer protecting them, in the form of the frictionless ball bearings making up the wheels, much like the nearly frictionless axles of the plane. Oh sure, the wheels on the plates spun big time but the plates never did move. You tried the trick later that night by pulling the table cloth twice as hard. You saw no difference. You have determined that the table cloth being pulled was absolutely irrelevant to where the plates would be.

Next up, putting little fans on top of the plates in hopes they actually move. They will. They're sitting on frictionless ball bearing wheels. Once that is complete, it is off to impress your friends with the famous yank the tablecloth out from underneath moving plates trick.

markm0722  posted on  2005-12-02   23:42:29 ET  Reply   Untrace   Trace   Private Reply  

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