Science Squabbling

OK, air is being pulled through the engines giving you thrust... Is this also sucking air over/under the wing?

the conveyor belt doesn't stop the air moving over the wing.
the initial "engines go!" (this could be by a rocket pushing forward instead of air being pulled through the turbine blades) pushes forward, the air moves over the wing, moves faster over the wing than under and boom! magnets and shit.

A whole dissertation? Wow. The treatment that I am most familiar with fits on a napkin.

well- sort of.
he wrote a dissertation which he then presented to a non-serious lecture series in Oxford.
it was fun.

they should use the changing your mind about selecting the boxes on that idiotic noel edmonds vehicle / tv show where they just open boxes
dealer might give them the £250,000 deal or no deal is it ?

they should use the changing your mind about selecting the boxes on that idiotic noel edmonds vehicle / tv show where they just open boxes
dealer might give them the £250,000 deal or no deal is it ?

Yeah - change their mind about appearing on tv with weirdo Edmonds and showing themselves to be a complete cock.

@mash and @riva:the guy that answered that (cecil someone) no longer responds to this question. he is fed up with it.

YouTube- Mythbusters - Plane on conveyor belt the practice!

the conveyor belt doesn't stop the air moving over the wing.
the initial "engines go!" (this could be by a rocket pushing forward instead of air being pulled through the turbine blades) pushes forward, the air moves over the wing, moves faster over the wing than under and boom! magnets and shit.

But you only get lift when there's a difference in air pressure above and below the wing... Where the fuck is the air flow coming from? From air being sucked into the front of the engines? I doubt very much you'd get enough air moving across the wing to cause enough lift in that situation... But I could be wrong... Doubt it tho'...

i think xkcd did it best: http://blog.xkcd.com/2008/09/09/the-goddamn-airplane-on-the-goddamn-treadmill/

Wingedangel... I think youre fucking awesome.

Oh, and can you make a wind-powered vehicle that goes down-wind faster than the wind? (hint: the answer is yes)

Teenslain, this problem encourages a logical error, you quite probably - given the original question see a situation where the conveyor cancels any forward motion of the plane so the plane is stationary relative to the air, no airspeed = no lift. the fact is the conveyor is spinning the wheels but that is basically irrelevant for the plane because the wheels are not powered in takeoff, the plane takes off as normal in the opposite direction of the conveyor only when it's airspeed is sufficient. for this to happen the conveyor must long enough for normal takeoff ie as long as a runway and at takeoff the wheels simply spin twice as fast as usual.

I was under the impression that you got nothing for free- for example I cannot just pour water into an ice-cube tray and leave it on the kitchen worksurface and expect ice-cubes to form.

RE freezing water: Did you know that water at 35C freezes faster than at any other temperature. The "Mpemba effect". A school child discovered it

Teenslain, this problem encourages a logical error, you quite probably - given the original question see a situation where the conveyor cancels any forward motion of the plane so the plane is stationary relative to the air, no airspeed = no lift. the fact is the conveyor is spinning the wheels but that is basically irrelevant for the plane because the wheels are not powered in takeoff, the plane takes off as normal in the opposite direction of the conveyor only when it's airspeed is sufficient. for this to happen the conveyor must long enough for normal takeoff ie as long as a runway and at takeoff the wheels simply spin twice as fast as usual.

What about the Monty Hall problem, which is one of my favourites, popularised in the Curious Incident of the Dog and the Night Time:

You are on a game show where there are three closed boxes, two of which contain a Unipac and one of which contains a Robin Mather, custom built to your specification. You pick a box. The host (VB?) opens one of the other boxes and shows you a Unipac inside it. Is it in your favour to change the box that you picked, to stick with your original choice, or does it not make any difference?

Change your pick!

There's three possible scenario's, if you change your pick you will win the Robin Mather with 2 of the 3 scenario's. Sticking with your pick you only win the Mather with 1 of the 3 scenarios.

I just read that Europes largest producer of bananas is Iceland, where they are grown in greenhouses heated by geothermal water.

That has melted my brain.

ouch - Ive got some junior disprin somewhere..

it's easy to assume that the planes engines must produce a 100mph forward thrust to cancel a 100mph conveyor it sits on, but that is not the case, all that needs to be cancelled is the resistance from the tyres and bearings as they roll freely, so for example a thrust of 2mph may well be sufficient for the plane to remain static relative to the ground.
When the plane produces forward thrust it makes no significant difference if the ground/conveyor moves forward backwards or is static, the jets or props pull or push it through the air and the wheels are independent of that

as you know - its only airspeed that counts - a static plane in a wind tunnel will take off with enough airspeed even if the groundspeed is 0mph.

Sorry i'm no jonny ball

I just read that Europes largest producer of bananas is Iceland, where they are grown in greenhouses heated by geothermal water.

That has melted my brain.

And 'they' told you it was a Volcano.

Ha!

geothermal energy creating energy from nothing they'll probably say the magic in the rocks is heating the water

now there's some science bunkum if ever i heard it

Change your pick!

There's three possible scenario's, if you change your pick you will win the Robin Mather with 2 of the 3 scenario's. Sticking with your pick you only win the Mather with 1 of the 3 scenarios.

The right answer. Can you list the three scenarios? I think it is easier to list nine scenarios.

Science is awesome. I am in awe of people that can come up with theories and explanation of our universe. Even if they're wrong. All I can do is fucking draw, and not that well. I need to go to university and do a degree in Quantum Theory, Mechanical Engineering, Aeronautics and Astronomy, if that exists. I'm over graphic design.

Ion winds don't work in a vacuum.

Ion winds don't work in a vacuum.

What? Is that a band name?

should be.

The right answer. Can you list the three scenarios? I think it is easier to list nine scenarios.

Nine?!

Say box one is the box the the Mather in:
You pick box 1 : change your pick and you loose, keep your pick and you win
You pick box 2: change you pick and you win, keep your pick you loose
Pick box 3: change you pick and you win, keep your pick you loose

Original -> 2nd choice after 1 box removal

001 -> 01-/1-0
010 -> 10-/-01
100 -> 01-/0-1

Original choice is 1/3 chance
if you change you mind after one box is removed the new chance is 1/2

I think.. I may have got it wrong.

Edit: I have, got it wrong, this is correct:

If you dont change you mind chance of winning is still 1/3.
After one loosing box is removed the chance of either box having a win or loss is equal, 2/3.