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+///Chapter No 7 Fluid Mechanics
+///Example 7.4 Page No:116
+////Find mass density of liquid
+//Input data
+clc;
+clear;
+dy=21*10^-3;      //Horizontal plates in mm
+du=1.4;            //Relative velocity between the plates in m/s
+mu=0.6;            //Oil of viscosity 6 poise in Ns/m^2
+
+///Calculation
+tau=mu*(du/dy);  //Shear in the oil in N/m^2
+
+///Output
+printf('shear in the oil= %f N/m^2 \n',tau);