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diff --git a/278/CH22/EX22.1/ex_22_1.sce b/278/CH22/EX22.1/ex_22_1.sce
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+//find...
+clc
+//solution
+//given
+D=300//mm
+R=0.150//mm
+Cs=0.003
+N=1800//rpm
+w=188.5//rad/s
+rho=7250//kg/m^3
+//let m eb the mass of fly wheel
+//ref fig 22.6
+//total energy at E =total energy at A
+//Eb=E+295
+//Ec=E+295-685=E-390
+//Ed=E-350
+//Ee=E-690
+//Ef=E+270
+//Eg=E
+//Ea=E
+//max energy is at B and min is a E
+//dE=Eb-Ee=985
+//dE=985//mm^2
+//conveting to N-m
+dE=985*0.087//N-m
+//dE=m*R^2*w^2*Cs
+m=dE/(R^2*w^2*Cs)//kg
+printf("the mass of flywheel is,%f kg\n",m)
+//let t be thickness and b be width of rim
+//b=2t
+//A=b*t=2*t^2
+//m=A*2*%pi*R*rho=13668*t^2
+t=sqrt(m/13668)//m
+printf("the thicknes and width is,%f m\n,%f m\n",t,2*t)
+\ No newline at end of file