A block of weight W slides over a thin film of liquid of viscosity η with terminal velocity. The area of contact is A and the characteristic length is taken to be the thickness of the film of liquid. What is the Reynold's number for the flow? The density of the liquid is ρ. Assume a linear velocity profile.

Engineering

Physics

Viscosity

Question

$\frac{ρmgsin {θh}^{2}}{η^{2} A}$

$\frac{ρmgsin θh}{ηA}$

$\frac{ρmgsin {θh}^{2}}{η^{2} A^{2}}$

$\frac{ρmgsin {θh}^{2}}{ηA}$

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$R = \frac{ρvd}{η}$

$mgsin θ = \frac{ηAv}{h}$

$y = \frac{mgsin θh}{ηA}$

$R = \frac{Pmg \sin {θh}^{2}}{η^{2} A}$

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