Brain Teaser - Will it take off??
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Joined: Mar 2002
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From: NH
Originally Posted by Wookie
Clear as mud???
Joe
Joe
There is nothing about the first question that could give anybody a logical conclusion that the AIRplane will take off.
As I stated in a previous post there was not enough information to make a statement that the airplane could or could not take off.
In the original question all that is known is the aircraft is moving. That means nothing because there is no information about how fast the aircraft is moving. Airplanes can NOT fly unless they have enough airflow under their wings to create lift.
Different airplanes require different speeds at which to reach “lift off”.
So, there is no correct answer to the original question because it is lacking the necessary information to reach a logical and correct conclusion.
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Joined: Oct 2004
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From: The Internet
Right. The whole trick here is that you conjure up an image of an airplane sitting stationary on a conveyor belt runway. It fooled me.
Now, place a car on the same hypothetical conveyor belt, and it will be stationary, because the wheels pushing against the ground is what causes forward motion, not a prop pulling back air.
Now, place a car on the same hypothetical conveyor belt, and it will be stationary, because the wheels pushing against the ground is what causes forward motion, not a prop pulling back air.
Senior Member
Joined: May 2000
Posts: 873
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From: Somewhere in the EU
Originally Posted by Net Wurker
De-Ja-vu or however that's spelled.....haven't we had this conversation before?
https://www.f150online.com/forums/sh...&postcount=226
https://www.f150online.com/forums/sh...&postcount=227
https://www.f150online.com/forums/sh...&postcount=228
https://www.f150online.com/forums/sh...&postcount=229
https://www.f150online.com/forums/sh...&postcount=230
And answered
Originally Posted by Net Wurker
Dear Kobi,
Hypothetical situation: You are cruising at 45000 feet in a jetliner, headed for New York. Meanwhile, down on Earth, terrorists have somehow managed to bring the end of the world nuclear scenario into full blossom. Any feasible place to land that 737, within range of the remaining fuel, has been obliverated.
Could you stand next to an open door, and when the 737 glides to within 5 – 7 feet of the ground, just jump off and be okay? I know the laws of physics rule against this, yet I have seen this very same scenario played out many, many time on Bugs Bunny. He is some how on the porch of a cabin that is falling, falling back to Earth. Right before impact, he simply steps off the porch. Problem solved.
Could this work?
Hypothetical situation: You are cruising at 45000 feet in a jetliner, headed for New York. Meanwhile, down on Earth, terrorists have somehow managed to bring the end of the world nuclear scenario into full blossom. Any feasible place to land that 737, within range of the remaining fuel, has been obliverated.
Could you stand next to an open door, and when the 737 glides to within 5 – 7 feet of the ground, just jump off and be okay? I know the laws of physics rule against this, yet I have seen this very same scenario played out many, many time on Bugs Bunny. He is some how on the porch of a cabin that is falling, falling back to Earth. Right before impact, he simply steps off the porch. Problem solved.
Could this work?
Originally Posted by kobiashi
Dear Net Wurker-
Wow. How amazing is it that you come up with a hypothetical situation that that very closely resembles what I will be doing tomorrow?!?!?!?!
First of all, I'll be in a 757 (WORST. PLANE. EVER.) but there was no way for you to know that.
With regard to you question, could it work? Well, I suppose in some parallel universe - or a cartoon universe - it could. Sometimes I'm an optimistic person and find myself thinking anything's possible . . . I guess this must be one of those times.
As you stated in your post, you know the laws of physics pretty much rules this out . . . and I'm sure you understand that an object within an object traveling at a certain speed maintains the speed of the object it's in. That's why, for instance, when you're in an airplane that is traveling at 700 miles an hour, and you're standing in the isle, and you jump up, that you don't go slamming into the back of the plane at 700MPH. So, even if you jumped off the aircraft 7 feet from the ground, you still have forward motion at the rate of speed the craft was traveling at, thereby assuring that you will be doing an excellent imitation of of a human bullet being shot INTO the ground. (We're not even going to address all those other issues of the size of the plane and the destructive wake it would leave that would consume you assuming you could just hop off a crashing jet.
You also are aware (I hope) that CARTOON PHYSICS is completely different than the physics of the universe you and I inhabit. Many people fail to take this into consideration and usually are unpleasantly surprised when they purchase and try to use an ACME™ Rocket Sled™ or ACME™ Rocket Powered Sneakers™. Just something to keep in mind.
Kobi-
Wow. How amazing is it that you come up with a hypothetical situation that that very closely resembles what I will be doing tomorrow?!?!?!?!
First of all, I'll be in a 757 (WORST. PLANE. EVER.) but there was no way for you to know that.
With regard to you question, could it work? Well, I suppose in some parallel universe - or a cartoon universe - it could. Sometimes I'm an optimistic person and find myself thinking anything's possible . . . I guess this must be one of those times.
As you stated in your post, you know the laws of physics pretty much rules this out . . . and I'm sure you understand that an object within an object traveling at a certain speed maintains the speed of the object it's in. That's why, for instance, when you're in an airplane that is traveling at 700 miles an hour, and you're standing in the isle, and you jump up, that you don't go slamming into the back of the plane at 700MPH. So, even if you jumped off the aircraft 7 feet from the ground, you still have forward motion at the rate of speed the craft was traveling at, thereby assuring that you will be doing an excellent imitation of of a human bullet being shot INTO the ground. (We're not even going to address all those other issues of the size of the plane and the destructive wake it would leave that would consume you assuming you could just hop off a crashing jet.
You also are aware (I hope) that CARTOON PHYSICS is completely different than the physics of the universe you and I inhabit. Many people fail to take this into consideration and usually are unpleasantly surprised when they purchase and try to use an ACME™ Rocket Sled™ or ACME™ Rocket Powered Sneakers™. Just something to keep in mind.
Kobi-
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Joined: Aug 2006
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From: Michigan
It has more to do with the fact that the wheels have nothing to do with the planes movement it is all in the prop. If that is what you are trying to say sorry it just didn't sound that way to me.
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From: Burleson, Texas
"A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction)."
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From: Vancouver
Ahh... A jet would not fly as we all have read, but a prop- plane would match the conveyer speed with the air flow past the plane and wings by the propeller. This would creat lift regardless of the conveyer speed and with enough airflow the plane would hover in "ground effect" with out ground speed.
Thread Starter
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Senior Member
Joined: Sep 2002
Posts: 2,165
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From: Cabot, AR
Wow, someone dug up an old one.
FYI it does not matter what type of plane (float planes w/o wheels are the exeption) is in this situation it will take off. It's all a trick to get a person thinking about ground speed which does not matter one bit as far a taking off goes.
FYI it does not matter what type of plane (float planes w/o wheels are the exeption) is in this situation it will take off. It's all a trick to get a person thinking about ground speed which does not matter one bit as far a taking off goes.