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29. According to principle of moments | |
A. | if a system of coplanar forces is in equilibrium, then their algebraic sum is zero [Wrong Answer] |
B. | if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero [Correct Answer] |
C. | the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point [Wrong Answer] |
D. | positive and negative couples can be balanced [Wrong Answer] |
E. | none of the above. [Wrong Answer] |