Use the Figure to the Right to Answer the Next

question 54

Multiple Choice

Use the figure to the right to answer the next problem. A ball of mass of mass m is tied with a light string to a vertical post of radius R_p and slides on a frictionless horizontal surface. As the ball travels around the post, the string wraps around the post, shortening the length. At t = 0 s, its speed is v_o and radius is r_o.

-As the string wraps around the post,which of the following statements is true?

• A)Angular momentum is conserved but not the mechanical energy.
• B)Angular momentum is not conserved but the mechanical energy is conserved.
• C)Both the angular momentum and the mechanical energy are conserved.
• D)Angular momentum increases as the string gets shorter.
• E)Whether the angular momentum and mechanical energy are conserved depends on v_o and r_o.

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Definitions:

Labor-Force Participation

The fraction of the population of working age that is engaged in employment or in the search for a job.

Prime Working Age

The age range typically considered most productive and desirable for employment, often defined as 25 to 64 years.

Labor-Force Participation Rate

The percentage of the adult population that is in the labor force

Teenagers

A demographic group consisting of individuals typically aged between 13 and 19 years, characterized by physiological and psychological development from childhood to adulthood.