Matt H
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Registered: 11th Sep 01
Location: South Yorkshire
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One thing that didn't help is he text the AQA text line for an answer & it said it wouldn't 
The text line thing is you text a question to 63336 & it tells you the answer
Did you know that the largest thing ever found in an anal cavity is a bowling pin? 
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Danny H
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Registered: 10th Feb 05
Location: Gilberdyke, E Riding of Yorkshire
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Think of it as your on a treadmill wearing rollerskates holding onto the side. You would still be able to pull yourself forward with the same amount of effort no matter how fast the treadmill is going. The wheels will just spin faster on the roller skates.
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John
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Registered: 30th Jun 03
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Theres a txt number somewhere for google.
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LeeM
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Registered: 26th Sep 05
Location: Liverpool
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quote:
Originally posted by Danny H
Think of it as your on a treadmill wearing rollerskates holding onto the side. You would still be able to pull yourself forward with the same amount of effort no matter how fast the treadmill is going. The wheels will just spin faster on the roller skates.
this is a good way to think! also how about this, if u had an rc car on a treadmill both same speed, then pushed the rc car forward it would move forward yes? ure intervention is the same as the propulsion from the plane engines (if u get it)
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andy1868
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Registered: 22nd Jun 06
Location: Burscough, Lancashire
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so technically the plane isnt moving, only the wheels are, so no, i cant see it taking off, theres no depressurisation above the wings that produces the lift needed to take off. simple
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Robin
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Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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no, andy, the wheels are rotating freely, the engines are pushing the plane forward, it'll still take off.
imagine a toy car on a treadmill, if you push it forward, you can move it  (you pushing it is the same as the engines on the plane)
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andy1868
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Registered: 22nd Jun 06
Location: Burscough, Lancashire
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touché robin 
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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There are a number of states for the belt/plane combo to be in.
Everything is stopped - no force in any direction.
Belt is moving, plane is not supplying any thrust - plane will move backwards as the friction required to turn the wheels is larger than that required to hold it in place by air resistance.
Belt is moving, plane is supplying an equal amount of thrust to that supplied by the belt in the previous example - plan will overcome the backwards motion with an equal force and will sit still when compared to air, but not the belt, which is being counteracted by a small amount of thrust. Plane will not take off - no lift with no forward motion.
Belt is moving, plane is suppling enough thrust to take off - plane will accelerate and take off as normal. The amount of thrust in this example FAR OUTWEIGHTS the friction which is offered by the belt moving backwards. The disparity of equilibrium is managed by the wheels, which spin like a twat, moving fast anyway with respect to the air around them, then in addition the belt spins them even faster. However, the planes ability to move with respect to air and therefore generate lift is not affected.
That is all.
ps. bye thread soon
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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according to someone I know that works as an aeronautical engineer for General Electric (make and service the electrical components on boeing 747 engines)
it will depend vastly on a lot of factors that have not been mentioned such as:
1. is the conveyor belt powered?
2.if so, does the power/speed of the conveyor belt equall or exeed the power that is generated in thrust by the plane?
3.how long is the conveyor belt?
4. what is the wind speed?
5. what direction is the wind?
6. has the conveyor belt calculations in 1 & 2 had the weight of the plane taken into consideration?
in simple terms he said its impossible to say as there are too many factors to take into account to give a definate answer
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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Dave, all of that is largely academic, the frictional loss of the wheels would have to outweight the thrust generated by the engine, which is loads of friction, and therefore loads of heat, therefore taking off would be the least of your worries.
[Edited on 05-09-2006 by Ian]
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Dave A
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Registered: 10th Dec 03
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presactly
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Matt H
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Registered: 11th Sep 01
Location: South Yorkshire
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quote:
Originally posted by Ian
ps. bye thread soon
Don't delete it, just close it if needs be
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Jules S
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Registered: 24th Dec 03
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To clarify,
The linked thread question was edited by bradfinchamafter a fair amount of debate, to make it suitably ambiguous.
If the belt itself matches the planes wheel speed, the plane will take off.
However, if the conveyor belt (and chassis) move backwards in relation to the planes wheel speed it wont.
This particular debate has always been about the wording of the question
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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Hence me supplying four answers.
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Jules S
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Registered: 24th Dec 03
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quote:
Originally posted by Ian
Hence me supplying four answers.
You missed the fundamental point of the conveyor belt assembly moving in real space though mate.
Thats where the confusion in the wording usually arises 
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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I'm assuming certain things, yes. The mass of the snakes could of course scupper our plans for world travel.
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Jules S
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Registered: 24th Dec 03
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quote:
Originally posted by Ian
I'm assuming certain things, yes. The mass of the snakes could of course scupper our plans for world travel.
Turn the air con down mate....they would all be asleep
EDIT: ive not seen the film, i guess that was too obvious for hollywood though 
[Edited on 05-09-2006 by Jules S]
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drunkenfool
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Registered: 7th Feb 03
Location: Hereford Drives: Audi R8 V8
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"February 10, 2006 | Posted by: bordag
I seem to recall that the concorde crashed because the wheels rotated too fast and the tires decomposed. So you had best not push this too far."
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Melville
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Registered: 4th Jun 03
Location: Newcastle upon Tyne
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So am I right in thinking that the plane is effectively stationary on the conveyor belt?
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drunkenfool
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Location: Hereford Drives: Audi R8 V8
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no cos the converyer is only pushing against the wheels which aren't powered. Steve's analogy of the toy car being pushed along makes sense, even though no1 else seemed to listen to it
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Melville
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Registered: 4th Jun 03
Location: Newcastle upon Tyne
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But surely the planes engines would thrust (right terminology?) and make the plane move forward? Then the conveyor belt would move hence making the plane not move?
Im confusing myself by the minute
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Melville
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Registered: 4th Jun 03
Location: Newcastle upon Tyne
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Been thinking aout it some more and I cant understand how it would take off!!
The way I think of it is the same as running on a treadmill, you dont move and nor would the plane so how can it have air moving past the wings?
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Steve
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Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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people who think it wont take off are idiots TBPH
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Angie
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Registered: 27th May 04
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Plane would take off.
Don't try and land plane on said conveyor belt though.
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Jules S
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Registered: 24th Dec 03
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quote:
Originally posted by Angie
Plane would take off.
Don't try and land plane on said conveyor belt though.
Why?
That only relates to if the plane wont take off.....
 BTW....im in Yate
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