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April 18, 2015

April 18, 2015

Posted by **desh** on Tuesday, January 24, 2012 at 5:38am.

- physics -
**drwls**, Tuesday, January 24, 2012 at 6:32amIn the highly viscous "Stokes Law" Reynolds-number region (Re < 0.1), the viscous force is proportional to velocity*diameter*viscosity.

It does not depend upon density.

If the viscous forces are equal instantaneously,

V2/V1 = (D1/D2)*(Visc1/Visc2)

= (1/2)(4/3) = 2/3

This question is fundamentally flawed in my opinion, for this reason. In the steady-state limiting-velocity regime, the viscous forces cannot be equal in this case, since the force ratio must equal the weight (and mass) ratio, which is not 1 in this case.

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