An Isolated Object Is Initially Spinning at a Constant Speed

question 45

Multiple Choice

An isolated object is initially spinning at a constant speed. Then, although no external forces act upon it, its rotational speed increases. This must be due to

• A) an increase in the moment of inertia.
• B) an increase in the mass.
• C) an increase in the angular momentum.
• D) a decrease in the moment of inertia.
• E) impossible, angular momentum conservation is violated.

---

Definitions:

Lens

A piece of transparent material with at least one curved surface, used to focus or disperse light and form images.

Iris

The colored part of the eye that controls the size of the pupil and the amount of light reaching the retina.

Colored Part

The iris, the circular structure in the eye responsible for controlling the diameter and size of the pupils and thus the amount of light reaching the retina.

Pupil Size

The diameter of the circular opening in the center of the iris of the eye, which can vary in response to light exposure or emotional state.