A Light Rope Passes Over a Light Frictionless Pulley Attached

question 28

Multiple Choice

A light rope passes over a light frictionless pulley attached to the ceiling. An object with a large mass is tied to one end and an object with a smaller mass is tied to the other end. Starting from rest the heavier object moves downward and the lighter object moves upward with the same magnitude acceleration. Which of the following statements is true for the system consisting of the two objects?

• A) The center of mass remains at rest.
• B) The net external force is zero.
• C) The velocity of the center of mass is a constant.
• D) The acceleration of the center of mass is g, downward.
• E) None of the above statements are true.

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Definitions:

External World

Everything that exists outside the mind, including physical objects, events, and other people, as perceived through the senses.

Information Processing Model

A cognitive approach that compares human thinking to computer processing, emphasizing the way information is encoded, stored, and retrieved.

Encoding

The process by which information is transformed into a form that can be stored in memory.

Retrieval

The method of bringing forward and becoming aware of data kept in memory.