A small sphere attached to a light rigid rod rotates about an axis perpendicular to and fixed to the other end of the rod. Relative to the positive direction of the axis of rotation, the angular positions of the sphere are positive, its angular velocity is positive, and its angular acceleration is negative. The sphere is
A) rotating clockwise and slowing down.
B) rotating counterclockwise and slowing down.
C) rotating clockwise and speeding up.
D) rotating counterclockwise and speeding up.
E) first rotating clockwise and then counterclockwise.

Question

Quizplus · Accepted Answer

Given that the angular positions and angular velocity are positive while the angular acceleration is negative, the sphere is rotating in the positive direction (counterclockwise, assuming the conventional right-hand rule) but slowing down due to the negative angular acceleration.

A Small Sphere Attached to a Light Rigid Rod Rotates