Questions and Exercises
1. The governing equation of the bar shown below is given as
a. Define the space 
for the solution z1 of the above partial differential equation, similar to that of Eq. 4.7.
for the solution z1 of the above partial differential equation, similar to that of Eq. 4.7.b. Derive the energy bilinear form and load linear form for the bar.
c. Show that the energy bilinear form is bilinear and load linear form is linear.
d. Define the space of kinematically admissible virtual displacement S (as in Eq. 4.12) for the bar structure.
e. State the principle of virtual work for the bar structure. Identify trial and test functions, ...
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