Constraints and Statical Determinacy

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Homework Statement


Which of these bodies has redundant constraints for the given loading conditions? F_1 and F_2 are applied, known forces. In the first choice, the support at A is fixed and a cable connects points B and C. In the second choice, the support at A is a smooth pin, and a cable connects points B and C. In the third choice, the support at A is a single thrust bearing, and a cable connects points B and C.
Check all that apply.


Homework Equations


Redundant constraints - when a body has more supports than necessary to hold it in equilibrium it becomes statically indeterminate.


The Attempt at a Solution


the first and last seem to have redundant constraints.
 

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agree about a and b, but not about c.