A system of masses rotating in different parallel planes is in dynamic

1.	A system of masses rotating in different parallel planes is in dynamic balance if the
A.	resultance force is equal to zero
B.	resultant couple is equal to zero
C.	resultant force and resultant couple are both equal to zero
D.	resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero
Answer» D. resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

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

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