Which one of the following statements describes the condition(s) for which a rig

Question

Which one of the following statements describes the condition(s) for which a rigid body is in equilibrium?

The drawing illustrates an overhead view of a door and its axis of rotation. The axis is perpendicular to the screen. There are four forces acting on the door, and they have the same magnitude. Rank the torque ? that each force produces, largest to smallest.

Each external torque may not be non-zero, but the sum of the torques must be zero. Which one of the following statements describes the condition(s) for which a rigid body is in equilibrium?

Explanation / Answer

For the equilibrium: there should be no linear and no rotational accelaration, so the sum of forces as well as the sum of torques are zero

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