For the bar-spring problem E, A f(x)/P x, uo P L Rigid bar k BMW (a)...

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For the bar-spring problem E, A f(x)/P x, uo P L Rigid bar k BMW (a) Use the method of virtual work/variational principle to find the Euler equations (governing equations) and boundary conditions. (b) Assuming the bar is elastic, use the principle of total minimum energy to find the Euler equations (governing equations) and boundary conditions. (c) Comment on the difference of the findings from (a) and (b). For the bar-spring problem E, A f(x)/P x, uo P L Rigid bar k BMW (a) Use the method of virtual work/variational principle to find the Euler equations (governing equations) and boundary conditions. (b) Assuming the bar is elastic, use the principle of total minimum energy to find the Euler equations (governing equations) and boundary conditions. (c) Comment on the difference of the findings from (a) and (b).