Can an object be in mechanical equilibrium when only a single force acts on it? explain. 1. no; even one force is too much. there should be no forces acting on an object. 2. no; at least one other force is needed to cancel the action of the first force. 3. yes; a single force is necessary to keep the object in mechanical equilibrium. 4. yes; the object will act back with an equal and opposite force.

Option 2

Explanation:

For an object to be in mechanical equilibrium it is necessary that the sum total of all the forces acting on that forces must be zero.

If we consider an example of the object in free fall as in case of an object falling from space, in that case, the only force acting on the object is due to the gravitation force of the earthy on that object without any external forces acting on it.

Thus in this case the sum total of all the forces will not be zero and the particle is in accelerating motion under gravity.

Thus for an object to be in mechanical equilibrium, it is necessary that another force must be present to counter balance it.

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

i believe the answer is a