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diff --git a/3765/CH3/EX3.13/Ex3_13.sce b/3765/CH3/EX3.13/Ex3_13.sce
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+clc
+// Example 3.13.py
+// In example 3.12, what is the length of the duct required to choke the flow//
+
+
+// Variable declaration from example 3.12
+M1 = 3.0          // mach number
+C1 = 0.5222       // C1 = 4*f*L1star/D
+f = 0.005         // friction coefficient
+D = 0.4           // diameter of pipe (in ft)
+
+// Calculations 
+L1star = 0.5222 * D/4.0/f 
+
+
+// Result 
+printf("\n Length required to choke the flow is %.2f ft", L1star)
+