Which of the following conditions are always necessary in order for an object to be in...
Which of the following conditions are always necessary in order for an object to be in mechanical equilibirum?
I. The sum of the external forces on the object must be zero
II. The sum of the external torques on the object must be zero
III. The object must be at rest
A) I
B) II
C) III
D, I, II, and III
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