Quote:
Originally posted by XPLORx4:
Quote:
Originally posted by Mobycat:
[b]

What moves the wheels? (regardless of whether they are free spinning)
The plane's motion through SPACE (both on the ground and through AIR) sets the wheels in motion.[/b]
But it's not moving through the space. The air is moving at the same speed as the plane - relative to the conveyor belt.

What moves?

Conveyor belt
Wheels

What does NOT move?

Ground
Air

Since the air is not moving, it cannot provide lift to overcome the downward force of gravity.
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"Nature has constituted utility to man the standard and test of virtue. Men living in different countries, under different circumstances, different habits and regimens, may have different utilities; the same act, therefore, may be useful and consequently virtuous in one country which is injurious and vicious in another differently circumstanced" - Thomas Jefferson, moral relativist