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OpenStudy (anonymous):

You have a cylindrical balloonship with the mass of 25 000kg, how should I calculate the airfriction on it's speed?

OpenStudy (anonymous):

Assume it has a blunt cross-section of Area A. The pressure due to motion will be approximately p = (1/2) rho v^2 Use this to estimate the force, which is not really friction. To get friction, you would need to determine Reynolds number Re = rho v d / mu, and check some handbooks of fluids. Friction will depend on the lateral area of the airship.

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