A Metal Bar Is Hanging from a Hook in the Ceiling

question 85

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:

Psychological Dependence

A condition in which an individual feels compelled to continue using a substance due to emotional or psychological needs.

Mental Craving

A strong emotional or psychological desire or need, often for a specific substance or experience.

Emotional Craving

A strong desire that is driven by a person's feelings rather than physical need.

Cultural Heritage

The legacy of physical artifacts and intangible attributes of a group or society passed down from generation to generation.