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+// Problem no.2.13,Page no.38
+
+
+clc;clear;
+close;
+
+d=90 //cm //Diameter of grindstone
+t=10 //cm //thickness of grindstone
+rho=0.0026 //Kg/cm**3 //Density
+
+//calculations
+
+//M=Mass of grindstone=Volume *Density=Area*Thickness*Density
+M=%pi*4**-1*d**2*t*rho //Kg 
+R=d*2**-1 //cm //radius
+I_g=M*R**2*2**-1 //Kg*m**2
+
+k=R*(2**0.5)**-1 //cm //Radius of gyration
+
+//Result
+printf("Radius of gyration is %.2f cm",k)