When the belt moves in the direction shown, which pulleys turn clockwise?

When a belt moves in a specific direction, it affects the movement of the connected pulleys based on how they are arranged. If the belt moves in a way that exerts force on the first pulley, it will cause that pulley to turn in a direction opposite to that of the belt. As the first pulley turns, it will drive the second pulley, and this interaction continues down the line of pulleys.

In this scenario, if the belt is moving in one direction and all pulleys are interconnected via the belt, then each pulley gets affected by the movement of the belt. Specifically, if the first pulley turns, it causes the next one in line to turn, and so forth.

Consequently, if the belt moves in a way that initiates motion, it can make all pulleys turn, assuming they are all regularly linked and not slipping. This interconnected movement of all pulleys explains why the correct answer indicates that all of them turn clockwise when the belt is in motion in the described direction.