Quote:
Originally posted by vitaly:
Quote:
Originally posted by Mobycat:
[b]
Quote:
Originally posted by MattyX:
[b]Neither matters.
Actually, it does.
...
[/b]
Why is it so hard to comprehend that the only speed that matters is the speed of the plane relative to air? Not to the observer, not to the treadmill, not to the ground, not to your uncle, nothing else, but the AIR.
[Argue] [/b]
Huh?

I'm not arguing that it won't take off. It will. I'm just pointing out that the original problem is worded badly - it never says what the plane is moving in relation to (the ground or the belt).

The "not-take-off" could happen - but ONLY if the speed is relative to the belt - AND it must be zero to do that.
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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