initial commit / add all books

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+//Variable declaration:
+a = 1                           //Length of cross-section (m)
+b = 0.25                        //Width of cross-section (m)
+v = 1*10**-5                    //Kinematic viscosity of air (m^2/s)
+Re = 2300.0                     //Reynolds Number
+cm = 100                        //Cenitmeters in a meter
+
+//Calculation:
+Dh = 2*a*b/(a+b)                //Hydraulic diameter of duct (m)
+V = Re*v/Dh*cm                  //Maximum air velocity (cm/s)
+
+//Result:
+printf("The maximum air velocity before the flow becomes turbulent is : %.1f cm/s.",V)