2 files changed, 15 insertions, 0 deletions
diff --git a/629/CH12/EX12.4/ex12_4.txt b/629/CH12/EX12.4/ex12_4.txt
new file mode 100644
index 000000000..7c7ae6ac9
--- /dev/null
+++ b/629/CH12/EX12.4/ex12_4.txt
@@ -0,0 +1,2 @@
+ 
+ The drag force on the sphere = 2.58 N.
+\ No newline at end of file
diff --git a/629/CH12/EX12.4/example12_4.sce b/629/CH12/EX12.4/example12_4.sce
new file mode 100644
index 000000000..3cf8712ef
--- /dev/null
+++ b/629/CH12/EX12.4/example12_4.sce
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+clear
+clc
+//Example 12.4 DRAG FORCE ON A SPHERE
+k=1.4;
+p=101; //pressure[kPa]
+M=0.7; //Mach number
+q=k*p*M^2/2 //kinetic pressure[kPa]
+CD=0.95;
+D=0.01; //[m]
+A=%pi*D^2/4 //area[m^2]
+//Drag force
+FD=CD*q*A*10^3 //[N]
+printf("\n The drag force on the sphere = %.2f N.\n",FD)
+\ No newline at end of file