Structural Analysis
Principle of superposition is applicable when

Deflections are linear functions of applied forces
None of these
Material obeys Hooke's law
The action of applied forces will be affected by small deformations of the structure

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Structural Analysis
The effective length of lacing is the distance

All of these
Between the inner ends of effective lengths of welds connecting the members
Between the inner end rivets of the bar for single lacing
0.7 of the distance between the inner end rivets of the bar for double lacing

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