DweebyTwonkyHead
Rank #3883 on Content
Level 223 Comments: Mind Blower Offline
Send mail to DweebyTwonkyHead Block DweebyTwonkyHead Invite DweebyTwonkyHead to be your friend 
| Last status update: | -
|
| | |
| Personal Info | |
| Gender: | male |
| Age: | 55 |
| Date Signed Up: | 1/01/2010 |
| Last Login: | 1/13/2016 |
| Location: | Edinburgh |
| FunnyJunk Career Stats | |
| Content Ranking: | #3883 |
| Comment Ranking: | #8426 |
| Highest Content Rank: | #2102 |
| Highest Comment Rank: | #4171 |
| Content Thumbs: | 2990 total,
3642 ,
652 |
| Comment Thumbs: | 2427 total,
2989 ,
562 |
| Content Level Progress: | 34% (34/100) Level 129 Content: Respected Member Of Famiry → Level 130 Content: Respected Member Of Famiry |
| Comment Level Progress: | 33% (33/100) Level 223 Comments: Mind Blower → Level 224 Comments: Mind Blower |
| Subscribers: | 0 |
| Content Views: | 201683 |
| Times Content Favorited: | 185 times |
| Total Comments Made: | 1007 |
| FJ Points: | 497 |
| Favorite Tags: | forever alone (2) |
Maybe the oldest FJ'er?
latest user's comments
| #30 - I chortled .... Loudly! | 08/04/2015 on Taco Bell | 0 |
| #333 - ...three years? Shouldn't it be.......... … | 08/04/2015 on Nope. Denied. Rejected. | 0 |
| #233 - Can't believe this guy is still going!!! Wow! | 08/04/2015 on Engineering Question | -1 |
| #115 - Keiserdjg = everything that is wrong with this planet. ...&quo… [+] (8 new replies) | 08/03/2015 on Engineering Question | -1 |
 greater minds than i have already fucking fixed this problem...... UPDATE 2: I've been thinking about how the problem is posed (for now as I'm typing this) and it occurred to me that the constraint "run at the same speed as whatever the planes tyres rotation speed" actually means run such that the plane doesn't move with respect to the ground. Consider a wheel of radius R on a treadmill. The treadmill surface has a linear speed vT to the right. The center of the wheel has a linear speed vP to the left. The CCW angular speed of the wheel is: ω=vT+vPR If "run at the same speed as whatever the planes tyres rotation speed" means: ω=vTR then the constraint requires vP=0. That is, the question, as posed, is: If the treadmill is run such that the plane doesn't move, will the plane take off? Obviously, the answer is no. The plane must move to take off. Looking at mwengler's long answer, we see what is happening. The rotational speed of the tires and treadmill are not the key, it is the acceleration of the treadmill that imparts a force on the wheel axles (ignoring friction for simplicity here). So, it is in fact the case that it is possible, in principle, ( don't think it is possible in practice though) to control the treadmill in such a way that it imparts a holding force on the plane, preventing it from moving. But, once again, this force is not proportional to the wheels rotational speed, but to the wheel's angular acceleration (note that in the idealized case of massless wheels, it isn't even possible in principle as the lower the moment of inertia of the wheels, the greater the required angular acceleration). #132 -
anon (08/04/2015) [-] The wheels don't move the plane, the Jet engines still generate thrust... Even if the runway is moving in the oposite direction, the engines will still push the plane forward. The wheels will rotate at double the speed they usually would, but the plane will still move forward. The forward motion will cause air to pass over and under the wings, thus generating lift. Given a long enough runway (and thus time to accelerate), it WILL take off. #144 -
anon (08/04/2015) [-] A plane will indeed take off with its brakes applied. The brakes are built to bring the craft to a stop when it's coasting around, not to hold the plane stationary at full throttle.  Do you know what a pre-flight is? During the pre-flight, the engine is running full throttle with brakes applied during one test. The plane will sit still. #204 -
anon (08/04/2015) [-] No, it really isn't. Friction is independant of speed so once you overcome it with thrust then the plane will slide along the floor. This doesn't change whether the wheels are locked or not. The wheels are there in a plane only to reduce friction. | ||
| #3 - Someone needs to make a GPS that has Tom Cruise's voice...........' | 08/03/2015 on Cheeseburger Eddy | 0 |
| #4 - ...to kill it and get your arrow back!.... [+] (1 new reply) | 07/28/2015 on Guy hunts an animal. It lives. | +1 |
| | ||
| #48 - Cunt | 07/28/2015 on Reputation Systems in games | 0 |
| #199 - Would love a ring toss....and that game! | 07/25/2015 on Remember this shit? | 0 |
| #10 - Sean Connery, holding up "NASHA" girl... | 07/24/2015 on Fascinating photos from... | +6 |
| #28 - Pages 14\15: wide audience.. Page 16: narrow audience.. | 07/24/2015 on Women's Magazines | 0 |
| #27 - Posted same then saw yours! | 07/24/2015 on Women's Magazines | 0 |
| #26 - Grrrr....lose, versus loose! | 07/24/2015 on Women's Magazines | 0 |
| #20 - Broke everything but the CPU? Really? What kinda hammer did it use? | 07/23/2015 on I'm sad | +10 |
| #222 - **DweebyTwonkyHead used "*roll picture*"** **DweebyTwonkyHe… | 07/22/2015 on You can't leave FJ until... | 0 |
| #221 - **DweebyTwonkyHead used "*roll picture*"** **DweebyTwonkyHe… | 07/22/2015 on You can't leave FJ until... | 0 |
| #5 - ...no excuse for incompetence.....the irony it hurts! | 07/21/2015 on Leaving children or animals... | 0 |
| #3 - Been using radeon ramdisk ... Awesome! Try it guys! | 07/17/2015 on RAM | 0 |
| #2 - But, but .... I'm here. ... And, so are they! [+] (1 new reply) | 07/17/2015 on Holiday! | 0 |
 run through the halls anouncing an Admin party, if they run into the hall asking if you're serious, then thats them. | ||
| #5 - ....Don't die in your sins.....eh? | 07/11/2015 on Repent, losers... | +1 |
| #49 - Aye! | 07/11/2015 on atleast california gets a sea | +1 |
| #86 - I watered him! | 07/06/2015 on 4chan comp | 0 |
| #22 - Kuster Beaton..... | 07/03/2015 on this man | 0 |
| #50 - Baby monitor - picking up someone else's, sa e, monitor! | 07/02/2015 on Creepy stories | 0 |
| #79 - Hour can they no have Maltesers? ******* peasants! | 06/30/2015 on Maltesers | 0 |
| #79 - Wonderful! Sure he'd be very proud! | 06/29/2015 on Alan Turing's Statue in... | 0 |
