Quote:
Originally posted by TJ:

3. If I am walking on a tread mill "at 4 mph..." measured as if I had a geared speedometer...I am REALLY GOING ZERO MPH GROUND SPEED.
You are going zero compared to the ground AROUND the conveyor, not the conveyor. Which is also compared to the air since it is calm.
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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