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+//Example 6.8 
+clc;
+clear;
+//part a :
+Ao=.1;// amplitude at minimum frequency in mm
+A=100;//maximum amplitude
+Q=A/Ao;//quality factor
+disp(Q,"Quality factor")
+//part b
+w=100;//resonance frequency in rad/sec
+T=Q/w;//energy decay time
+disp(T,"energy decay time in sec")
+//part c
+hw=1/(2*T);// half width of power resonance curve
+disp(hw,"half width of power resonance curve in rad/sec")