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Q: If in planar system, X parts/members are there with Y no. of forces, then condition for statically determinacy is :
  • A. Y < 3X
  • B. Y > 3X
  • C. Y = 3X
  • D. None of these
Correct Answer: Option C - For a coplanar structure there are at most three equilibrium equation for each part, So that if there is a total of 'x' part and y number of forces and moment reaction components. We have, y = 3x (statically determinate) y > 3x (statically indeterminate)
C. For a coplanar structure there are at most three equilibrium equation for each part, So that if there is a total of 'x' part and y number of forces and moment reaction components. We have, y = 3x (statically determinate) y > 3x (statically indeterminate)

Explanations:

For a coplanar structure there are at most three equilibrium equation for each part, So that if there is a total of 'x' part and y number of forces and moment reaction components. We have, y = 3x (statically determinate) y > 3x (statically indeterminate)