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In a statically determinate plane truss, the number of joints (j) and the number of members (m) are related by

1. j = 2m − 3
2. m = 2j + 1
3. m = 2j − 3
4. m = 2j − 1

Correct answer: m = 2j − 3

Solution

The correct option reflects the relationship derived from the equilibrium conditions of a statically determinate truss, where the number of members is determined by the number of joints minus three, accounting for the two-dimensional nature of the structure and the three equilibrium equations available.

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