The rock in Figure 5.14 is suspended by a string tied to the ceiling and is undergoing u...

The rock in Figure 5.14 is suspended by a string tied to the ceiling and is undergoing uniform circular motion in a horizontal plane. What is the direction of the net force on the rock?

(a) It is along the string.

(b) It is downward (from gravity).

(c) It is toward the center of the circle.

(d) The net force is zero.

(reference figure 5.14)