For the bar hanging under its own weight shown in Figure P3–57, determine the nodal displacements using (a) two equal-length elements and (b) four equal-length elements. Let A = 2 in2 , E = 30 106 psi, and weight density ρw = 0:283 lb/in3. (Hint: The internal force is a function of x. Use the potential energy approach.)
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