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Index of Subjects Hi Dave, It appears that the exponents are screwed up, at least in the message that came back to us. If it's unreadable or too confusing let me know and I'll rewrite with a more literal notation. Martial annabelle wrote: > Hi Dave, > > Here’s a back-of-the-envelope dimensional analysis that crudely > explains why transported particle mass M is proportional to the sixth > power of fluid velocity V: > > The force of the flowing water is reasonably proportional to the > cross-sectional area of the particle, which is M^2/3. The force is > also proportional to the square of the velocity (highschool physics > conservation-of- momentum). So now you have force ~ (V2 ) (M^2/3) . > > To transport the particle you reasonably need the force to be of the > order of magnitude of the mass, i.e. proportional to the mass. So M ~ > (V2 )( M^2/3), or M ~ V6. > > I hope these exponent notations go through ok. > > Regards, Martial Thiebaux
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