Question: A system of masses rotating in different parallel planes is in dynamic balance if the resultant. (a) force is equal to zero (b) couple is

A system of masses rotating in different parallel planes is in dynamic balance if the resultant.

(a) force is equal to zero

(b) couple is equal to zero

(c) force and the resultant couple are both equal to zero

(d) force is numerically equal to the resultant couple, but neither of them need necessarily be zero.

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