For the bar hanging under its own weight shown in Figure P3–57, determine the nodal disp...

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 ρ_w = 0:283 lb/in³. (Hint: The internal force is a function of x. Use the potential energy approach.)