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What is not the condition for the equilibrium in calculations involved in the determination of the centre of mass?

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What is not the condition for the equilibrium in calculations involved in the determination of the centre of mass?

(a) ∑Fx=0

(b) ∑Fy=0

(c) ∑Fz=0

(d) ∑F≠0

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Correct answer is (d) ∑F≠0

Easy explanation: For the equilibrium in the three dimensional system of axis we have all the conditions true as, ∑Fx=0, ∑Fy=0 and ∑Fz=0. Also we have the summation of the forces equal to zero. Which is not a non-zero value.

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