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All you need to know is that a conveyor cannot hold a plane still relative to the ground no matter how fast it turns in the opposite direction if the wheels are freely rotating. (ie they don"t have the brakes on) The amount of force it can apply to the plane through the wheels is absolutely...

You have to ask yourself what the point of the question was. Was it to demonstrate to people not knowing how lifts and forces work that jets and props do not generate any vertical lift by themselves and thus a plane not moving relative to the air will not fly no matter how fast the props spin...

Here is a post that anyone can understand. This question was either created by someone that thought he was being tricky but screwed up or is a trick question to try and get people to focus on something that is irrelevent to the problem.

Amazingly you could argue both ways. Technically, you cannot use a conveyor to hold a plane stationary that is trying to take off (Not unless you made it so incredibly fast that the friction created by the wheels turning is enough to negate the thrust of the engines. Which would probably be...