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| Thread ID: 64128 | 2005-12-04 07:01:00 | Sunday night Brain Bender - Airplane Physics | miknz (3731) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 410162 | 2006-08-27 06:40:00 | Once upon a time :D i intended to do many things, and a small amount of these things have actually happened. But anyway, the belt only moves IF the plane does, and then in the opposite direction, so the belt means nothing other than increased wear on the wheel bearings owing to twice the normal rotation speed of the wheels. This is probably of no relevance to the flight that may or may not occur. If the plane moves forward as per normal, it eventually takes off. If it doesn't move, then we are back to our picnic on the wings scenario We actually need to know if it fires up the engines and starts moving at normal speed in order to answer the question with certainty. In short, insufficient information, plus a big red herring runway set up. |
personthingy (1670) | ||
| 410163 | 2006-08-27 10:50:00 | The wheels are completely irrelevant. They could be moving backwards for all we care. Apart from a tiny bit of friction, the wheels moving have absolutely no effect on the speed of the plane. Therefore we can settle this argument by saying that if it is a functional plane, if it turns on it's engines and tries to take off normally, IT WILL SUCCEED. There's no need to be pedantic with all the if's and what if's and assumings, just be sensible. I'm sorry to spoil your fun for all those in favour of a picnic, but that's just being picky with the question. | arthuritus (9360) | ||
| 410164 | 2006-08-27 11:08:00 | Well we ALL know that it WON'T take off.. This is because it is never mentioned that it has been cleared for takeoff or even has a flight crew. |
gibler (49) | ||
| 410165 | 2006-08-27 11:15:00 | Would someone please bloody put this to the test and shut everyone up!!! | bob_doe_nz (92) | ||
| 410166 | 2006-08-27 11:18:00 | Well we ALL know that it WON'T take off.. This is because it is never mentioned that it has been cleared for takeoff or even has a flight crew. It doesn't need to be cleared for takeoff - it has been hijacked by terrorists. arthuritus - it would matter if the wheels were going backwards - that would mean that either the plane was going backwards, or the wheels are doing a perpetual burnout. If the burnout senario was true, none of the wheels would have any traction, and (someone will correct me if I am wrong) I think that the wheels would be needed to keep it going straight untill it gets up to speed |
Greven (91) | ||
| 410167 | 2006-08-27 12:02:00 | Would someone please bloody put this to the test and shut everyone up!!! How much is a remote-controlled toy plane from The Warehouse? :D |
Renmoo (66) | ||
| 410168 | 2006-08-27 12:22:00 | Imagine a plane landing on the same runway, the belt moving it the other direction at the same speed as the plane. Unless the plane lands with the wheel brakes locked on and the most grippiest tyres in the world the plane will land as expected, it wont stop dead. Or landing with the belt going the same direction as the plane, the plane would also land as expected apart from the wheels going in a backwards rotation. |
Rob99 (151) | ||
| 410169 | 2006-08-29 20:58:00 | All will depend on if they paid their departure taxes or not... | BoboTheClown (5652) | ||
| 410170 | 2006-08-30 10:06:00 | I've just come across this thread - Jeez, I can see why they are worrying about NCEA physics! OK, let's do the experiment (warning - long post coming). We have an aircraft standing on an endless conveyor belt. Let's put a light source & photocell array on the ground (not the belt) beneath one of the wings. The cell detects reflected light from markings on the wing surface and measures any forward velocity of the wing. The signal is used to control the belt drive motor, and a feedback system tries to keep the wing stationary over the ground. Start the engines and give it full throttle - the plane starts to move and immediately the belt moves in the opposite direction. Now attend to a detail - make sure we have negligible friction in the wheel bearings (after all this is a physics problem). As the belt rotates in the opposite direction the plane doesn't give a stuff, because the belt can't transmit its movement to the plane. So the plane shoots off the belt and either takes off (if we do the experiment at the end of a runway) or else crashes and burns into the wall at the end of the room. Got some friction in the wheel bearings? Just give it a bit more throttle. |
Jayess64 (8703) | ||
| 410171 | 2007-02-02 02:46:00 | Hi Greg:D :D :D | JackStraw (6573) | ||
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