Question: The threshold shear stress for a Colgate Tooth paste (a Binghum plastic fluid) is oc. Consider that the finger pressure of a normal human being

The threshold shear stress for a Colgate Tooth paste (a Binghum plastic fluid) is oc. Consider that the finger pressure of a normal human being is Po. Derive the expression for minimum (D/L) ratio for which the flow should occur. If the Colgate tooth paste is replaced by pepsodant having threshold shear stress op, what should be the variation of minimum D/L ratio for flow to occur?

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