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Originally Posted by sanddrag
(Don't make me put my RC plane on my treadmill   ) |
rememebr, that doesnt work because your treadmill will not match the airplane's velocity. not relative to the treadmill but to the .... well we'll say a far person's point of view.
[quote=sanddrag]
Are you guys just being sillyto make this thread go on forever or do you really still not "get it"?
well, im trying the best i can to keep this discussion going.... if thats what you mean. i completely understand both sides. and i just support the seemingly weaker side right now.
the people who say it will fly are completely ignoring that the conveyorbelt will match the planes speed. of course common sense says that it is impossible for a conveyorbelt to do what the problem says, but WHAT IF.
and someone said the limit of the plane's output.... well then what is the limit of the conveyorbelt's speed (or power)... if that reaches infiniti for the lack of a better term, what then? if the conveyorblet has the power to do exactly what the problem says, what happens?
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Why not build this huge conveyer belt system as an alternative to making short runways on a mountain where real estate is a prime commodity???
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a HUGE fan blowing air towards the plane would be easier.
okay... the aircraft carrier catapult.... waht if the catapult extended forever and the plane was mounted backwards... and the speed of the catapult was varaiable? (improbable... maybe impossibel... but a concept) .... then what?(oh btw the catapult is not mounted to the plane itself but has a plate that also continues forever underneath the tires of the plane)
oh. since so many people are saying sumthing about the wheels spinning twice the speed of takeoff, thats not right. only if the treadmill was matching the speed of the plane... not matching the speed of the plane instantaneously... which means it doesnt matter how fast the wheels spin, the belt spins faster and faster so the friction of the bearings are enough to keep the plane from moving forwards.... and since the problem does not say there is a limit on how fast the conveyorbelt can go before failure, we must say it doesnt fail EVER.
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2) put your RC car on a treadmill, turn on the treadmill so that the car when going full forward stays in place now strap a rocket engine to the car and light it, the car will go forward because it is being pushed by the rocket(you could even use a non motorized car more like the plane and put the rocket on that and no matter how fast you send the treadmill the car still goes forward)
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BADDDD example. the treadmill must speed up when the car speeds up due to the rocket.... the conveyor belt matches the speed. not just once but continuously.
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And in the question posted, the only force that is trying to stop the plane from accelerating to takeoff speed is that same (small) rolling resistance of the wheels.
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correct. which is why you can say either side is correct. if you ignore conveyorbelt limits