A Metal Bar Is Hanging from a Hook in the Ceiling

question 41

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:

Net Change

Net change refers to the difference in the closing price of a stock, bond, commodity, or index on a given day compared to the closing price on the previous trading day.

Utility Function

A mathematical representation of how different bundles of goods are ranked according to their utility or satisfaction provided to the consumer.

Equivalent Variation

A measure in economics that indicates the amount of money a consumer would need to reach their initial utility level after a price change.

Price Change

A variation in the cost of goods or services over time, which can be an increase or decrease.