If a number of forces act on a rigid body, each force may be replaced by an

Question:

If a number of forces act on a rigid body, each force may be replaced by an equal and parallel force acting through a fixed point, together with a couple. For the rigid body to be in equilibrium,

(a) the resultant force at the fixed point must be zero

(b) the resultant couple on the body must be zero

(c) both resultant force and couple must be zero

(d) none of the above need be zero.

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