Consider the pulley-block systems shown in Conceptual Example 11-5.

(a) Is the tension in the string on the left-hand rotating system (the one with the moveable masses at the ends of the rod) greater than, less than, or equal to the weight of the mass attached to that string?

(b) Choose the best explanation from among the following:

I. The mass is in free fall once it is released.

II. The string rotates the pulley in addition to supporting the mass.

III. The mass accelerates downward.