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+//Torsional spring constant of a propeller shaft
+//Exa_1_3
+clc;
+clear;
+//refer fig:1.25
+G=80e+9; //shear modulus of shaft in N/m^2
+D12=0.3; //outer diameter of AA section in m
+d12=0.2; //inner diameter of AA section in m
+l12=2; //length of 12 segment in m
+kt12=(G* %pi *(D12^4-d12^4))/(32*l12); //spring constant of section 12
+
+D23=0.25; //Outer diameter of BB section in m
+d23=0.15; //inner diameter of BB section in m
+l23=3; //length of 23 segment in m
+kt23=(G* %pi *(D23^4-d23^4))/(32*l23); //spring constant of section 23
+
+kteq=(kt12*kt23)/(kt12+kt23);
+disp(kteq,"Torsional spring constant of a propeller shaft in N-m/rad = ");