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Initially I would think no-fly but that's because I didn't have an idea of airplanes and the wheel not being mechanical. And of course remembering it's the air thrust that moves it and the wheel just for rolling nicely.<br /><br />But the bicycle/skateboard explanation made it for me. It's everyday things that we are more familiar, like when you have a grinding wheel or a motor, and on the other hand you put a sellotape ring on your pen, keep it stationary so that the grinding wheel friction rotate it backwards, no matter how faster you didn't need to excert more counter force. It reminds me of little games we played, I remember how simple the force it has to be to just counteract the friction.<br /><br />Anyway, was a great read, fortunately I never had an opinion on this problem when I came here, so maybe I wasn't biased and that's why I read and tried to understand it. I had an easier go with Monty Hall problem, but this one I always avoided it or never knew what the fuzz was about.BugoTheCathttps://www.blogger.com/profile/02935085187743095470noreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-11890523711338076592013-10-25T06:54:26.278-04:002013-10-25T06:54:26.278-04:00the definition on the XKCD page DIFFERS from the o...the definition on the XKCD page DIFFERS from the one in this blog.<br /><br />This blog discusses "The speed of the belt is matched to the airplane's speed"<br /><br />XKCD's version says "conveyor belt is designed to exactly match the speed of the wheels".<br /><br />It's important, because the answers are actually differentAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-27736694716378766272011-08-29T18:09:05.267-04:002011-08-29T18:09:05.267-04:00It seems to me that the original problem was this:...It seems to me that the original problem was this: "If you have a plane that needs a 2000ft runway to get up to 70mph before it can take off, and you didn't have enough room to build a 2000ft runway, could you build a 40ft treadmill, crank it up to 70mph, and take off straight up?". I think we can all agree unanimously the answer to that question was NO IT WOULDN'T WORK.<br /><br />Then some unknown smart-aleck said "oh yeah? What if the treadmill was 2000ft long? You could rev up the plane's engine and move forward along the treadmill and yes you'd be able to take off at the end of it, even if the treadmill operator cranked up the speed of the treadmill way faster than 70mph." And guess what, the smart-aleck is right. To which I say SO FREAKING WHAT?? Why on earth would anyone want to build a 2000ft treadmill when they could just build a 2000ft runway? You've defeated the whole point of the original puzzle.sbunny8https://www.blogger.com/profile/08142990282834887638noreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-5253148988233490572009-03-18T01:35:00.000-04:002009-03-18T01:35:00.000-04:00If the turbines are spinning, won't they push the ...If the turbines are spinning, won't they push the air across the wings regardless of the planes movement?Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-49739189358063664472008-11-03T20:52:00.000-05:002008-11-03T20:52:00.000-05:00......If I didn't laugh my ass off every time I wa.........<BR/>If I didn't laugh my ass off every time I was Rickrolled, I'd come to your house and cut you.Greg Leyhttps://www.blogger.com/profile/00976316910204324046noreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-54110978037678835602008-10-26T10:47:00.000-04:002008-10-26T10:47:00.000-04:00I just got rickrolled./golfclapI just got rickrolled.<BR/><BR/>/golfclapAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-28572636999065643482008-09-10T03:46:00.000-04:002008-09-10T03:46:00.000-04:00Hey, just wanted to say Randall just blatantly rip...Hey, just wanted to say Randall just blatantly ripped you off:<BR/><BR/>http://blag.xkcd.com/<BR/><BR/>You might want to send him a nice email about this.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-51314811681060801412008-09-10T02:32:00.000-04:002008-09-10T02:32:00.000-04:00Josh,You're right, for an ideal wheel.However, wha...Josh,<BR/>You're right, for an ideal wheel.<BR/>However, what speed will our wheels and treadmill be rotating at once the plane starts to move? It should be rotating at it's maximum speed to try to keep the plane still but if it's an ideal treadmill it doesn't have a maximum speed.<BR/><BR/>So the question really is whether you consider that the treadmill is ideal or the plane.<BR/>I took the treadmill to be ideal because we're told in the question that the treadmill CAN track the plane's speed. The three rewordings make it even clearer by referring to the treadmill as "very powerful".<BR/><BR/>I think that most of the problem here comes from the fact this site claims to be the definitive analysis but then goes on to give a single yes answer. The definitive analysis would surely but a matrix of assumptions with an answer for each. Unfortunately the original question is so hazy that it will be quite a large matrix.CJhttps://www.blogger.com/profile/16462630218188256471noreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-37289437427003244222008-09-09T20:07:00.000-04:002008-09-09T20:07:00.000-04:00the whole point of this blog was to get you idiots...the whole point of this blog was to get you idiots to stop debating it. you could at least have enough class to debate it elsewhere.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4573243256384234585.post-59261034552606385692008-09-09T17:45:00.000-04:002008-09-09T17:45:00.000-04:00Christopher, draw a Free Body Diagram of the wheel...Christopher, draw a Free Body Diagram of the wheel. What causes the wheels to spin? It is not the thrust of the airplane, which acts on the center of gravity of the wheel, it is the static friction from the treadmill, f=ks*N, which gives it a torque, causing rotation. The friction force doesn't increase with speed, because it is a based on two constants, the coefficient of static friction and the weight of the airplane. So, as long as the thrust from the engines is greater than the static friction of the wheel on the surface, it will always take off.Joshhttps://www.blogger.com/profile/12026069679970599465noreply@blogger.com