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1. if I hold my hand perpendicular to the floor and move it quickly through the air horizontally to the floor, a leaf in front of the path of my hand moves. If my hand is parallel to the floor and I move it the same way, the leaf doesn't move (much). Answer - must be displacing more air -> more drag.
3. I agree with Brian but suspect there may be another source of pressure. If you put air in a balloon and then step on it, it will pop - it can only take so much pressure. I think that in addition to ambient air pressure, the weight of the car over the tire will add some more pressure so the "actual" pressure in the tire as measured by a guage will be less.
5. volume of the sphere is 904778 ish cubic feet and a cubic foot of air weighs 0.075 lbs (at sea level which is fair here) -> 67858 lbs
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Tim
1972 911e
Last edited by tiwebber; 02-13-2008 at 08:35 AM..
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