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Strawman
(acolyte)
06/23/06 05:43 AM
Re: A Physics Riddle new [re: Wraith2]  

Exactly how long is the conveyor belt?

COME ON ENGLAND!

sonofsilence
(two inch thoughts)
06/23/06 05:49 AM
Re: A Physics Riddle new [re: Strawman]  

and what colour is it?



Strawman
(acolyte)
06/23/06 06:04 AM
Re: A Physics Riddle new [re: sonofsilence]  

Brian, I'd kindly advise you not to take the piss, my question is a relevant one.

For instance, if the conveyor belt is sufficiently long that plane is taking off. It doesn't matter what the conveyor belt is doing because the airplane's energy is acting on the air, not the belt - I shall simplify the problem thusly: imagine instead of a plane, you've got a rocket with wheels sitting on that belt - when that rocket fires, it's eventually going to rocket off the end of that belt, which means that it doesn't remain stationary to the ground, and if it had wings, it would fly.

COME ON ENGLAND!

exorcist
(grinning soul)
06/23/06 06:19 AM
Re: A Physics Riddle new [re: Strawman]  

THE POWER OF CHRIST COMPELS A PLANE TO GET ITS LIFT VIA THE BERNOULLI EFFECT! THIS HAS TO DO WITH WING SHAPE AND ITS INTERACTION WITH AIR MOVING RAPIDLY PAST! IF THE PLANE HAS NO MOTION RELATIVE TO THE WIND, THERE WILL BE NO LIFT TO FORCE THE FUCKING PLANE UP!!

THAT PLANE IS GOING NO WHERE FAST!! KIND OF!



Nature_Boy
(crash course raver)
06/23/06 07:31 AM
Re: A Physics Riddle new [re: exorcist]  

The exorcist's word of Christ speaks the truth:

an aeroplane's wing is shaped so that when moving forward, the air moving under the wing is moving faster than the air on top of the wing. This creates a pressue gradient and thus an upwards force (commonly called "thrust", or "upthrust").

If you are on a conveyor belt no air is moving past the wing, hence no upwards thrust.

Its about time I had a signature

The Thin White Duke: David Bowie Tribute Band

Dara
(acolyte)
06/23/06 08:56 AM
Re: A Physics Riddle new [re: Wraith2]  

The wheels of a plane are not there to make it move: they're not motorized. They're there to reduce friction during takeoff and add friction when landing. What moves a plane forward are jet turbines or propellors which move the air backwards, thereby propelling the plane forward.

So the plane will move forward relative to the ground at the same speed as normal (100 knots), and will be moving forward 200 knots relative to the conveyor belt. So the wheels of the plane will be moving at twice their normal speed, and the plane will take off.

Slan libh,

Daz

"I could count my friends on one hand, but I'd look like I was giving an invisible friend a hand job." - Shelle

Asteroid
(kook)
06/23/06 09:09 AM
Re: A Physics Riddle new [re: Dara]  

Hello are you a pilot? That plane isn't gonna lift off unless it has a very unusual aspect ratio (wing shape) and an unusually large prop.

The prop produces thrust which helps drag the plane through the air. That air, flowing over the wings, produces lift. The prop is not simply a fan that blows air over the wings.

Don't act like you're above somebody if they insult you. Stop implying that monkeys only eat bananas - by Schizophrenic

sonofsilence
(two inch thoughts)
06/23/06 09:13 AM
Re: A Physics Riddle new [re: Nature_Boy]  

what if there are ridges on the converor belt creating wind current?

and it is a windy day?



diamondogz74
(freecloud)
06/23/06 09:22 AM
Re: A Physics Riddle new [re: Dara]  

In reply to:

The wheels of a plane are not there to make it move: they're not motorized


I might be missing something here, but how does an airplane taxi?


London Bye Ta-Ta...

Dara
(acolyte)
06/23/06 09:38 AM
Google = God new [re: diamondogz74]  

This page explains it a bit better than I attempted to.

Slan libh,

Dara

"I could count my friends on one hand, but I'd look like I was giving an invisible friend a hand job." - Shelle


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