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+// Example 1_7
+clc;funcprot(0);
+// Given data
+W=2000;// lbf
+F=W;// lbf
+Z=8.00;// ft
+g_c=1;// Dimensionless
+g=9.81;// m/s^2
+
+// Calculation
+m=((F/0.2248)*g_c)/(g);// kg
+Z=Z/3.281;// m
+PE=(m*g*Z)/g_c;// kJ
+// In the Engineering English units system, we have
+Z=8.00;// m
+g_c=32.174;// lbm.ft/lbf.s^2
+g=32.174;// ft/s^2
+m=(F*g_c)/g;// lbm
+PE=(m*g*Z)/g_c;// ft.lbf
+PE=PE/778.17;// Btu
+printf("\nThe potential energy of an automobile,PE=%2.1f Btu",PE);