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Question
If in planar system, X parts/members are there with Y no. of forces, then condition for statically determinacy is:-
,d leryh; fudk; esa] X Hkkx@vo;o gSa ftu ij Y la[;k esa cy vkjksfir gS] rks LFkSfrd :i ls fMVjfeuslh ds fy, 'krZ gS&
A.
Y < 3X
B.
Y > 3X
C.
Y= 3X
D.
None of these
Answer ( Option C)

Y= 3X

Solution

For a coplanar structure there are at most three equilibrium equations for each part, so that if there is a total of x parts and y no of forces and moment reaction components,
we have
y = 3x, statically determinate
y > 3x, statically indeterminate

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