Timeline for If velocity is constant, how can $p = F\cdot v$ be non zero?
Current License: CC BY-SA 3.0
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| Apr 5, 2015 at 14:24 | comment | added | Floris | A simple estimate for the mass of air moved is obtained by looking at the area swept by the wings per unit time - wing span times velocity. Given area and density you can estimate velocity needed for a certain impulse. Recognizing of course that at 10km air density is not 1.2 kg/m<sup>3</sup>... | |
| Apr 5, 2015 at 9:20 | history | answered | John Rennie | CC BY-SA 3.0 |