TY! as far as i see it, this is common sense h:

 

my lame attempt at acting smart: h:

assuming negligible rotational static/kinetic friction/inertia/etc...
considing the following:

plane is stationary... conveyer belt moves backwards.
similar to pulling a tablecloch off a table with the contents remaining,

the plane will stay stationary and the wheels will spin along with the conveyor belt.

add in the thrust from the engines, and the plane will accelerate forward.

the wheels/conveyor are independent from the engine/air system

 

i still disagree. :happysad:

wether the plane will be able to generate enough velocity relative to the air to takeoff is debateable, i still do not find it possible for the belt to keep the airplane from going down the runway.

 

I'm with him. There may be some frictional/bearing/tire/length of runway issues, but the plane will accelerate forward.

 

I don't know I think you guys are wayyyyyyyyyyyyyyyyyyyyyyyyyyy over analyzing it.

The read the text as written. The plane will not be moving relative to the ground. Period. That is what it says. It's not a matter of if the plane can generate enough thrust or not to over come the belt.

It states that it will not since the planes speed (the thrust generated by the planes engine) will be matched by the belt.

 

The problem only states that the conveyor belt moves backward at a velocity equal to the plane's forward velocity, that's it. The thrust from the engines (to first order) is unaffected by the plane's forward velocity: the engine's always push the plane forward.

The question is whether the conveyor belt will provide enough force to cause the plane to counteract the forward thrust from the engines. If it can, the plane won't move, if it can't the plane moves forward. So, think of this. If I hung the plane from the ceiling using string and roll the wheels by hand. This is essentially what the conveyor belt is doing, it is rolling the plane's wheels. So you might get the plane to sway a little bit, but because the wheel can spin freely, your rolling of the plane's wheels does just that, and doesn't move the plane. The other thing this shows is that the RPM the wheels spin has absolutely no bearing on how fast the plane is moving. So, the conveyor belt exerts little to no force on the plane, and the thrust from the engine allows the plane to accelerates forward.

 

i agree with joe and rick
you need the speed for the wings to do their thing

 

Umm you are over analyzing man. I know what the question is. You are assuming that the belt can't while when I read it, it is saying it will.

Insteads of using speed like you're doing use distance. as soon as the plane moves 1inch the belt will return the plane to it's original position. The belt system will continue to do so no matter how fast the plane tries to accelerate.

That is what the question is saying no?

 

That is true for a car on a conveyor belt, where the wheels provide movement, but the wheels on the plane serve no purpose other than to hold the plane up and allow it to be moved by the plane's engines

 

do u realize how much momentum is required to create lift for these passenger planes? And a freaken pilot said no! AND they are HUGE!


most of u r smart, but not street smart. get ur face out of the books and look at reality. actually, even in theory, it still wouldnt fly. this thing isnt a freaken fighter jet which creates thrust out of no where! i mean, even those need a runway (small but they still count). it needs its momentum and speed over a distance. as i said before which no one read i guess, do u EVER see a plane launching into the air from a dead stop? NO they travel, and pick up speed/lift THEN proceed to the flying.