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Determining zero force in truss

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I need some help solving the following problem. I'm unsure on the steps to solve.

1, Determine the zero- force members in each truss

(a)
(b)

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The expert determines the zero-force member in each truss.

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1, Determine the zero- force members in each truss

(a)

Solution: We first determine the joints that have no external force applied. We have:
Joints C E G, H, I and J.

Looking at joint J, the zero-force member is GJ (case 2).
Looking at joint G, the zero-force member is GH ...

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