A Figure Skater Is Spinning Slowly with Arms Outstretched

question 29

Multiple Choice

A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her angular speed increases dramatically. The speed increase is a demonstration of

• A)conservation of kinetic energy: her moment of inertia is decreased, and so her angular speed must increase to conserve energy.
• B)conservation of total energy: her moment of inertia is decreased, and so her angular speed must increase to conserve energy.
• C)conservation of angular momentum: her moment of inertia is decreased, and so her angular speed must increase to conserve angular momentum.
• D)Newton's second law for rotational motion: she exerts a torque and so her angular speed increases.
• E)This has nothing to do with mechanics, it is simply a result of her natural ability to perform.

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Definitions:

Line Sizes

Pertains to the dimensions of length and width of lines, often considered in visual arts, geometry, and design.

Stanley Milgram

A renowned social psychologist from America, famously recognized for his provocative studies on compliance with authority figures during the 1960s.

Replications

The process of repeating research studies to verify or refute the findings of the original study.

Obedience Study

A research area in psychology that examines how individuals comply with authority, often highlighted by Stanley Milgram's experiments.