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Unformatted text preview: –2 . So, in fundamental units, P = kg•m –1 •s –2 . [P = N•m –2 (7/8); kg•m –1 •s –2 (1/8); partial credit for effort] QUESTION THREE Reynolds number The fairy fly is reputedly the smallest flying insect. In fact, the feathery appendages can barely be considered wings. How is it that a fairy fly can fly? See Next Page [formula setup (2/8); units (4/8); rational answer (2/8)] Hints: A comparative approach may be most useful, considering the physical environment of a fairy fly compared to that of a normal size bird. You can approximate their relative flight velocities as 2000 body lengths per minute. Terminal velocity may also be helpful, and is defined by: V t = 2 mg " AC d where V t is the terminal velocity, m is the mass, g the acceleration due to gravity (9.81 m/s 2 ), the density of air, A the effective area and C d the drag coefficient (assume it is 24/R e ). SC/BIOL 2090.02 — Current Topics in Biophysics 07 October 2009...
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- Fall '10
- Mass, Newtons, fairy fly