Quote:
Originally posted by XPLORx4:
Quote:
Originally posted by Mobycat:
[b]So, if there is friction, the plane will roll backwards?

Can the plane match the force with its engines?

What if it can't do anything *beyond* matching it?
If there's friction in the wheel bearings, then yes, the plane will roll backwards.

Can the plane match the force with its engines!? I should hope so! Otherwise it needs bigger engines![/b]
And the last question? What's your answer?
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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