A Metal Bar Is Hanging from a Hook in the Ceiling

question 29

Multiple Choice

A metal bar is hanging from a hook in the ceiling when it is suddenly struck by a ball that is moving horizontally (see figure) .The ball is covered with glue,so it sticks to the bar.During this collision

• A) the angular momentum of the system (ball and bar) is conserved about the hook because only gravity is acting on the system.
• B) the angular momentum of the system (ball and bar) is not conserved because the hook exerts a force on the bar.
• C) the angular momentum of the system (ball and bar) is conserved about the hook because neither the hook nor gravity exerts any torque on this system about the hook.
• D) both the angular momentum of the system (ball and bar) and its kinetic energy are conserved.
• E) both the linear momentum and the angular momentum of the system (ball and bar) are conserved.

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Definitions:

Critical Numbers

Values in the domain of a function where its derivative is zero or undefined, significant for finding local maxima and minima.

Alone

Being separate or isolated.

Task

A piece of work or duty to be completed, often with a specific objective.

Compounded Annually

Refers to the process of calculating and adding interest to the principal balance of an investment or loan once per year.