1.

The viscous force acting between two layers of a liquid is given by F/A=-n dω/dz This F/A may be called(a) pressure(b) longitudinal stress(c) tangential stress(d) volume stress.

Answer»

(c) tangential stress

Explanation: 

The force of viscosity acts between layers of the liquid and it acts along the surface. Thus F/A may be called tangential stress.  



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