Conservation of Angular Momentum: a Figure Skater Rotating at 5

question 35

Multiple Choice

Conservation of angular momentum: A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ∙ m². If the arms are pulled in so the moment of inertia decreases to 1.80 kg ∙ m², what is the final angular speed?

• A) 2.25 rad/s
• B) 4.60 rad/s
• C) 6.25 rad/s
• D) 1.76 rad/s
• E) 0.810 rad/s

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Definitions:

Single Winding

A coil of wire wound around a core, used in transformers or other electromagnetic devices, usually refers to having only one loop or layer.

Phase Voltage

The amount of voltage measured across a single phase of a three-phase load or power supply.

Line Voltage

The voltage as measured between the lines of a three-phase system.

Delta-Connected

A method of connecting three components of an electrical circuit where each component is connected end-to-end to form a closed loop or triangle.