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Imagine a plane is sitting on a treadmill
A physics and engineering riddle
I aint sticking round for another 50 posts of randomness.. nite
QUOTE (DrivinWest @ Dec 18 2006, 3:28 pm) 
Imagine a plane is sitting on a massive conveyor belt, as wide and as long as a runway. The conveyor belt is designed to match the speed of the plane exactly but moves in the opposite direction. The engines are running at take-off thrust, the brakes are off, etc. Everything is normal save for the fact the plane is on a treadmill.
Can the plane take off?
Can the plane take off?
The plane cannot take-off.
It is an imaginary plane.
An imaginary plane cannot fly, an imaginary fish cannot swim, and an imaginary man cannot walk.
Got it yet?
Anyone seen that episode of The Simpsons where Homer becomes a food critic? Hilarious
I rather liked the mouse in an exercise wheel post. So close and yet so far away.
And this one was the thrust buster!
QUOTE (sGb27 @ Dec 20 2006, 11:59 am)
How about this one: Start at the top line and try to understand why the plane moves forwards. Work your way down until you get to the bottom line, hopefully still understanding why the plane moves forwards.
OK, I give in. I still think DW should have posted this on April 1st mind.
It is so bloody simple: The forward speed of the plane from the take-off thrust is the matched by the speed of the conveyor belt. The speed differential is double. The plane takes off when it reaches enough speed to gain lift.
Still, some of the diagrams had me in tears laughing.
It is so bloody simple: The forward speed of the plane from the take-off thrust is the matched by the speed of the conveyor belt. The speed differential is double. The plane takes off when it reaches enough speed to gain lift.
Still, some of the diagrams had me in tears laughing.
QUOTE (Sin @ Dec 20 2006, 10:05 pm)
An imaginary plane cannot fly, an imaginary fish cannot swim, and an imaginary man cannot walk.
but you can wave an imaginary card - and if a footballer can be booked for waving an imaginary yellow card, should he be sent off for waving an imaginary red one?
QUOTE (Sin @ Dec 20 2006, 9:30 pm)
QUOTE (BadDoggie @ Dec 20 2006, 6:47 pm)
OK, this thing's been beaten to death.
Yes, I was trolling, and I enjoyed myself immensely.
THE PLANE WILL FLY.
Yes, I was trolling, and I enjoyed myself immensely.
Na-na-na-na-naa! I held out longer than you.
There comes a time when every joke must come to an end. It was over. There was nothing left to argue. Everything had been given away and anyone still claiming it wouldn't go was looking like a flat-earther.
woof.
@BD,
Yeah! But the interpretations had them going for a few pages.
Yeah! But the interpretations had them going for a few pages.
QUOTE (eurovol @ Dec 20 2006, 7:22 pm)
Then I decided to fuck with the people who were going on about the fucking thrust and engines and rope and toy cars and planes on a threadmill and being generally biligerant.
You really are a fachidoten aren't you? A fucking car could even move forward. It matters knot about the means of propulsion.
A car is sitting on a conveyor belt and goes twenty miles an hour by its speedometer. The conveyor belt is going in the opposite direction of the car 10mph. How long will it take the car to go 10 miles? Now do you get it?
You really are a fachidoten aren't you? A fucking car could even move forward. It matters knot about the means of propulsion.
A car is sitting on a conveyor belt and goes twenty miles an hour by its speedometer. The conveyor belt is going in the opposite direction of the car 10mph. How long will it take the car to go 10 miles? Now do you get it?
You do of course realise that this is nonsense right?
@ Sin, the best of all was this one that was so irrelevant that i thought i was reading a copy of Viz and Roger Irrelevant.
Completely hatstand.
Completely hatstand.
QUOTE (Dafydd @ Dec 20 2006, 10:26 pm)
You do of course realise that this is nonsense right?
What is nonsense?
Yep. It was so... what's the word I'm looking for?
Kinematic?
Kinematic?
I had actually thought about introducing fur to the conveyor belt with the hair facing forwards... but I thought I'd be tumbled.
QUOTE (bluedave @ Dec 20 2006, 10:32 pm)
@ Sin, the best of all was this one that was so irrelevant that i thought i was reading a copy of Viz and Roger Irrelevant.
Completely hatstand.
Completely hatstand.
Yeah, that was kind of weird. It came from nowhere like thunderbolts and lightening and he was already flying. I think he was trying to do the fandango.
QUOTE (eurovol @ Dec 20 2006, 10:35 pm)
What is nonsense?
You cannot substitue a car into into the question and get the same result. You do know this right?
It could be a jet-powered car with wings.
Except that it won't fly, there is no difference in reaching the needed speed as in moving away from a fixed point. Unless of course it is the one that I now want for Christmas.
QUOTE (Sin @ Dec 20 2006, 10:40 pm)
It could be a jet-powered car with wings.
That'd be a plane then.
QUOTE (Sin @ Dec 20 2006, 10:40 pm)
It could be a jet-powered car with wings.
Jet shmet, wheel power is enough.
Troll your wares elsewhere.
QUOTE (Adi @ Dec 20 2006, 10:41 pm)
That'd be a plane then.
Fuck! I've been tumbled.
so what was the answer in the end?
Did anyone mention that summer or winter tires would make a difference yet?
QUOTE (the Boy From Bozlem @ Dec 20 2006, 10:43 pm)
so what was the answer in the end?
The butler did it.
lol
QUOTE (Adi @ Dec 20 2006, 10:45 pm)
Did anyone mention that summer or winter tires would make a difference yet?
I think we're gonna need a diagram to work that one out.
TBFB ... like sh*t off a shovel.
QUOTE (eurovol @ Dec 20 2006, 10:41 pm)
Except that it won't fly, there is no difference in reaching the needed speed as in moving away from a fixed point. Unless of course it is the one that I now want for Christmas.
Well I think that you can certainly say it is different because with the car, the motive force derives from the wheels and Newton3 ™ is satisfied by the belt moving in the opposite direction from, and directly connected to the applied force; which it isn't with the 'plane.
can I just point out that all the Americans (and some brits ) are spelling tyres incorrectly.
) are spelling tyres incorrectly.
50% percent of people were correct but too stupid to convince the 50% of people they thought were more stupid.
QUOTE (Sin @ Dec 20 2006, 10:40 pm)
It could be a jet-powered car with wings.
Sin's talking about one of these.
Now that really is funny topcat_1.
It'll never fly.
wonders if this thread will self-destruct at 50 pages ?
I think I can clarify the answer once and for all:
A dick thrusts into a pussy at a given speed. The lady's hips thrust the pussy onto the dick and the same speed that the man thrusts his dick, but in the opposite direction. The passing speed of the dick and the walls of the pussy are double. The dick will cum.
A dick thrusts into a pussy at a given speed. The lady's hips thrust the pussy onto the dick and the same speed that the man thrusts his dick, but in the opposite direction. The passing speed of the dick and the walls of the pussy are double. The dick will cum.
The answer is that if you could push a plane fast enough it would take off because the most important element of the question is that the plane (not the wheels) only needs to match the speed of the conveyor belt. The wheels, the legs, the thrust, the engine, the method of propulsion, the anything else is irrelevant.
I don't think we've managed to convince eurovol yet.
QUOTE (Sin @ Dec 20 2006, 10:51 pm)
I think I can clarify the answer once and for all:
A dick thrusts into a pussy at a given speed. The lady's hips thrust the pussy onto the dick and the same speed that the man thrusts his dick, but in the opposite direction. The passing speed of the dick and the walls of the pussy are double. The dick will cum.
A dick thrusts into a pussy at a given speed. The lady's hips thrust the pussy onto the dick and the same speed that the man thrusts his dick, but in the opposite direction. The passing speed of the dick and the walls of the pussy are double. The dick will cum.
And you canna change the laws of physics...
QUOTE (Sin @ Dec 20 2006, 10:51 pm)
I think I can clarify the answer once and for all:
A dick thrusts into a pussy at a given speed. The lady's hips thrust the pussy onto the dick and the same speed that the man thrusts his dick, but in the opposite direction. The passing speed of the dick and the walls of the pussy are double. The dick will cum.
A dick thrusts into a pussy at a given speed. The lady's hips thrust the pussy onto the dick and the same speed that the man thrusts his dick, but in the opposite direction. The passing speed of the dick and the walls of the pussy are double. The dick will cum.
We've had the bitching and finally we've got the sex. Now all we're waiting for is religion and this thread is really complete.
QUOTE (Adi @ Dec 20 2006, 10:54 pm)
Now all we're waiting for is religion and this thread is really complete.
God never meant man to fly ! Da daaaaaaaa
A real god would have created aeroplanes on the sixth day. Poof!
QUOTE (bluedave @ Dec 20 2006, 10:56 pm)
God never meant man to fly ! Da daaaaaaaa
Now that's the answer... God didn't want that plane to fly. Even with winter tyres.
QUOTE (Dafydd @ Dec 20 2006, 10:47 pm)
Well I think that you can certainly say it is different because with the car, the motive force derives from the wheels and Newton3 ™ is satisfied by the belt moving in the opposite direction from, and directly connected to the applied force; which it isn't with the 'plane.
May the force be with you.
QUOTE (Adi @ Dec 20 2006, 10:53 pm)
I don't think we've managed to convince eurovol yet.
Convince me of what? That a car cruising on the same conveyor belt can't move forward at 10mph while the conveyor belt moves 10mph in the opposite direction? The force is weak in this one.
QUOTE (eurovol @ Dec 20 2006, 10:57 pm)
May the force be with you.
Convince me of what? That a car cruising on the same conveyor belt can't move forward at 10mph while the conveyor belt moves 10mph in the opposite direction? The force is weak in this one.
Convince me of what? That a car cruising on the same conveyor belt can't move forward at 10mph while the conveyor belt moves 10mph in the opposite direction? The force is weak in this one.
What if it is a car with secret magical ninja powers... in orange?
It it is UT orange then it is all good, but if it is burnt orange, then it crashes and burns like the pic I posted.
OK, I give up. Next problem thread.
What a daft suggestion ! Ninjas never dress in orange, would have to be in black or radiant yellow clearly.
I think you misunderstand eurovol - the car is simply the easiest way of explaining it. You can easily poke holes in the scenario, but that's not the point & because someone uses it does not mean they do not understand the solution.
Post ONE THOUSAND on this thread!
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