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will the plane fly?
11-25-2005, 09:15 PM
#1
Registered User
Thread Starter
This is the one and ONLY brain teaser thread
*** Brain Teaser ***
Imagine an airplane is on the beginning of a massive conveyor belt, 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?
Imagine an airplane is on the beginning of a massive conveyor belt, 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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11-25-2005, 10:26 PM
#9
Banned
Originally Posted by diesel_burner
from someody who fly's for a living, no wind over the wings, no lift. i wouldn't want to be on that plane.
11-25-2005, 10:40 PM
#11
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well if you have no wind over the wings you would have no lift. if you had the wind from the propulsion then yes, granted you had the speed for what ever plane you had. but for no wind over the wings it would be like a rock going through the air.
11-25-2005, 10:46 PM
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this question has got my mind thinking. read the question again and it seems that the only thing different is the wheels spinning backwards but everything else is the same, yes it would go.
11-25-2005, 11:20 PM
#13
Registered User
Of course the plane will take off. The plane's thrust is in relationship to the plane and the air around it. The tires are spinning at 0 MPH just prior to touchdown and over 100 MPH just after touchdown with the plane's speed not changing but a little bit at that touchdown point.
So, the plane will take off but the wheels will either be going 0 MPH or twice as fast as normal take off speed, depending on how you understand the conveyor belt to be moving in the puzzle.
Imagin wearing roller skates on one of those people movers (conveyor belt) they have at some airports. If you just stand there, the wheels are going 0 MPH in relationship to the belt but you are moving the speed of the belt. If it was a skinny belt and there were people on each side of it that were not on the belt and were pulling you along, it wouldn't matter in which direction or at what speed the belt was moving, as you would be going the speed of your helpers and in their direction. (Yeah, we are all balanced on roller skates, right?)
So, the plane will take off but the wheels will either be going 0 MPH or twice as fast as normal take off speed, depending on how you understand the conveyor belt to be moving in the puzzle.
Imagin wearing roller skates on one of those people movers (conveyor belt) they have at some airports. If you just stand there, the wheels are going 0 MPH in relationship to the belt but you are moving the speed of the belt. If it was a skinny belt and there were people on each side of it that were not on the belt and were pulling you along, it wouldn't matter in which direction or at what speed the belt was moving, as you would be going the speed of your helpers and in their direction. (Yeah, we are all balanced on roller skates, right?)
11-26-2005, 09:44 AM
#15
Originally Posted by Geico266
*** Brain Teaser ***
Imagine an airplane is on the beginning of a massive conveyor belt, 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?
Imagine an airplane is on the beginning of a massive conveyor belt, 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?
So the airplane is stationary on a conveyer belt. The belt is moving back as fast as the plane is moving forward, so the plane is basically on something like a dyno. So the plane is stationary.
How is there lift if the airplane is stationary? There isn't. There can't be.
Can an airplane take off with no lift? No it can't.
Problem solved.
Originally Posted by MnTom
OK, Here is another one: If a bulldozer is moving at a speed of 5mph the top of the track is moving at 10mph. How fast is the track on the bottom going?
(Did you type that one wrong, or are you being sarcastic?)
