Quote:
Originally posted by XPLORx4:
Quote:
Originally posted by XPLORx4:
[b]If the plane's engines were throttled up only enough to equalize the friction produced by the wheel bearings, then, yes, you could have a plane sitting motionless on a moving conveyor belt.
HOWEVER, since the original scenario specifies that the plane must have some kind of speed so that the conveyor can reverse-match it, how do you want to measure speed? In order for the conveyor to even get going, the plane would have to have some kind of ACTUAL speed...[/b]
That's the whole crux of it, though.

What's the speed relative to?
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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