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+//Example 5.5
+S=80*10^9;//Shear modulus (N/m^2), See Table 5.3
+r=0.750*10^-3;//Radius of nail (m)
+A=%pi*r^2;//Cross-sectional area of nail (m^2)
+delta_x=1.8*10^-6;//Amount of flex (m)
+L_0=5*10^-3;//Original length (m)
+F=S*A*delta_x/L_0;//Weigth of the picture (N)
+m=F/g;//Picture's mass (kg)
+printf('Mass of the picture = %0.1f kg',m)
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest