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| james |
 Feb 23 2006, 01:08 PM
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#1
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  Group: Super Administrators Posts: 3296 Joined: 2-March 01 From: Surrey, UK Member No.: 13  |
Here's a question for you:
QUOTE "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 the opposite direction). Can the plane take off?" A couple of links discussing it (and some funny rationalizations for peoples incorrect assumptions): www.kottke.org/06/02/plane-conveyor-belt www.straightdope.com/columns/060203.html -------------------- "We are number one, all others are number two or lower!" - The Sphinx, Mystery Men
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| quaker |
 Feb 28 2006, 05:59 PM
Post
#2
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 [Ringer Patrol]  Group: [Ringer Patrol] Posts: 825 Joined: 21-June 01 From: lost in space Member No.: 21 |
big stick immenent
 -------------------- if it bleeds we can kill it !
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Posts in this topic
james Brainteaser Feb 23 2006, 01:08 PM
camsmith Before I look up the links... Yes it can. Feb 23 2006, 01:21 PM james Anyone else? Feb 23 2006, 02:07 PM paul My initial thought is a big no! I can explain... Feb 23 2006, 03:33 PM james Fire away! - Show your workings out and the ex... Feb 23 2006, 04:39 PM womble erm quick change of mind after new logical suggest... Feb 23 2006, 04:52 PM camsmith OK... My very first thought was no, but then I t... Feb 23 2006, 04:57 PM womble hmmm yeah that actually sounds about it yeah that ... Feb 23 2006, 05:14 PM james Yeah that's exactly it - I think what makes us... Feb 23 2006, 05:25 PM Sam This is Paul - Can't be arsed to log out then ... Feb 23 2006, 08:12 PM Egg Designer therefore Paul your answer is no, as the engines p... Feb 24 2006, 12:45 AM paul Hence my statement of ' My initial thought is ... Feb 24 2006, 07:46 AM Egg Designer ahh yes! will read closer next time, it was la... Feb 24 2006, 08:36 AM quaker no it wont take off , paul has it almost right ( ... Feb 24 2006, 09:19 AM james Yes it will :biggrin:
Think of it like this - h... Feb 24 2006, 10:14 AM paul No it wont now quiet the lot of you Feb 24 2006, 01:35 PM camsmith Why, did you put the parking brake on? :biggrin:
... Feb 24 2006, 01:55 PM jamie The plane aint going anywhere
(until you turn off... Feb 24 2006, 02:26 PM james Ok how about a different approach:
Imagine you co... Feb 24 2006, 02:31 PM
jamie
Ok how about a different approach:
Imagine you c... Feb 24 2006, 03:16 PM camsmith Alternatively, think about a matchbox car (I'm... Feb 24 2006, 02:37 PM james The planes lift is certainly not just being caused... Feb 24 2006, 02:40 PM womble I would agree with camsmith on this one. Planes do... Feb 24 2006, 02:50 PM Emily I am ment to know the answer to this question havi... Feb 24 2006, 03:16 PM camsmith
and i dont agree with the matchbox thing
the mat... Feb 24 2006, 03:26 PM Emily and the argument suggests that no matter how fast ... Feb 24 2006, 03:17 PM jamie James/ cam are you saying that at the exact point ... Feb 24 2006, 03:23 PM jamie which was my point. AIRSPEED, not converyer speed Feb 24 2006, 03:30 PM camsmith The running on a treadmill is again not a fair com... Feb 24 2006, 03:30 PM jamie If the planes 'speed' is being matched and... Feb 24 2006, 03:34 PM camsmith
If the planes 'speed' is being matched an... Feb 24 2006, 03:36 PM james Another version to help you visualise the solution... Feb 24 2006, 03:43 PM jamie I think you may need to read the first post again
... Feb 24 2006, 03:45 PM Emily can we leave out that plane taking off, we all kno... Feb 24 2006, 03:51 PM james J - you are not understanding the difference betwe... Feb 24 2006, 03:56 PM Emily i cant even think if a way to explain it but as i... Feb 24 2006, 03:57 PM camsmith It's all about relative speeds...
A car's... Feb 24 2006, 03:58 PM james No worries hun (in case anyone wonders what we are... Feb 24 2006, 04:00 PM Emily we're about to have another now that you have ... Feb 24 2006, 04:02 PM Doctor My brain hurts :confused:
I took one look at th... Feb 24 2006, 04:06 PM camsmith I reckon we should use the treadmill, rollerblades... Feb 24 2006, 04:18 PM jamie I dont feel confused, I just think youre all wrong... Feb 24 2006, 05:13 PM paul A plane cannot take off without air moving over th... Feb 25 2006, 08:20 PM Emily will you all LISTEN and STOP talking about the blo... Feb 26 2006, 12:23 PM quaker computer says no Feb 27 2006, 01:09 PM Janette *cough* Feb 27 2006, 01:31 PM Egg Designer For the love of God! Cam - read the first pos... Feb 28 2006, 07:33 AM camsmith
For the love of God! Cam - read the first po... Feb 28 2006, 10:43 AM womble Ok this is a conversation I had from a colleague t... Feb 28 2006, 09:19 AM james Rory - I've run out of ways to explain how you... Feb 28 2006, 09:29 AM Emily can i ask the everyone read my post about the whee... Feb 28 2006, 09:36 AM womble Yeah id guess that close to how it works Em. As lo... Feb 28 2006, 09:44 AM james I don't understand that post Mike - on a freew... Feb 28 2006, 10:09 AM womble My answer was in 2 parts, one being with real phys... Feb 28 2006, 10:16 AM james Well yeah I understand what you are saying but as ... Feb 28 2006, 10:48 AM womble Yay you got it, its hypotheticaly what would need ... Feb 28 2006, 10:55 AM paul Anyone see the footie last night????? Feb 28 2006, 03:47 PM womble I bet all you saw was wedding books! :biggrin... Feb 28 2006, 04:57 PM Egg Designer OK, I understand that forward thrust in the real w... Mar 1 2006, 08:37 AM james And therein lies the rub - nowhere in the question... Mar 1 2006, 10:39 AM |
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