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 P: 31 Hello! I have some questions about the drag equation and aerodynamics: $F = \frac{1}{2}ρv^2CA$ I'm trying to calculate the atmospheric drag on a streamlined body (the drag coefficient will be a very small number) with a velocity of about 8 km/s at about 38,000 meters altitude, where the atmospheric density is only about $5.4\times10^-3$$kg/m^3$. So my question is; is the drag equation valid even for these extreme values, or is there a better equation that I can use? Secondly, which is the optimal geometrical shape for $\frac{Volume}{Drag}$? Is it a streamlined body shape? If it is a streamlined body shape, what is the equation for calculating its volume, and what is the equation for calculating its reference area? Can't find it! Really appreciate any help on this!