Conservation of Angular Momentum: a Record Is Dropped Vertically onto a Freely

question 47

Multiple Choice

Conservation of angular momentum: A record is dropped vertically onto a freely rotating (undriven) turntable. Frictional forces act to bring the record and turntable to a common angular speed. If the rotational inertia of the record is 0.54 times that of the turntable, what percentage of the initial kinetic energy is lost?

• A) 35%
• B) 18%
• C) 46%
• D) 60%

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Definitions:

Central Role

A position of primary importance or function within a system, process, or organization.

Amygdala

A part of the brain involved in experiencing emotions, particularly fear and pleasure, and in forming emotional memories.

Imprinting

A rapid learning process occurring early in the life of certain animals, leading them to recognize a specific stimulus (often a parent) as an object of trust and focus.

Responsive And Sensitive

Being responsive and sensitive involves reacting quickly and appropriately to stimuli or emotional cues, showing an acute awareness of the feelings and needs of others.