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| Teaching Since: | May 2017 |
| Last Sign in: | 408 Weeks Ago, 3 Days Ago |
| Questions Answered: | 66690 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A student is competing in a contest to design a radio-controlled blimp. The drag force acting on the blimp depends on the Reynolds number, Re = (ρVD)/µ, where V is the speed of the blimp, D is the maximum diameter, ρ is the density of air, and µ is the viscosity of air. This blimp has a coefficient of drag (CD) of 0.3. This π-group is defined as

Where FD is the drag force ρ is the density of ambient air, V is the speed of the air relative to the blimp, and Ap = πD2/4 is the maximum section area of the blimp from a front view. Calculate the Reynolds number, the drag force in newtons, and the power in watts required to move the blimp through the air. Blimp speed is 800 mm/s, and the maximum diameter is 475 mm. Assume that ambient air is at 20°C.

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