A 50-M Radius Playground Merry-Go-Round with a Moment of Inertia of of 2000

question 11

Multiple Choice

A 5.0-m radius playground merry-go-round with a moment of inertia of 2000 kg • m² is rotating freely with an angular speed of 1.0 rad/s.Two people,each having a mass of 60 kg,are standing right outside the edge of the merry-go-round and step on it with negligible speed.What is the angular speed of the merry-go-round right after the two people have stepped on?

• A) 0.20 rad/s
• B) 0.40 rad/s
• C) 0.60 rad/s
• D) 0.80 rad/s
• E) 0.67 rad/s

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Definitions:

Sensory Memory

The shortest-term element of memory, which is the ability to retain impressions of sensory information after the original stimuli have ended.

Physical Basis

The underlying physical or material foundation for an object, phenomenon, or process.

Flashbulb Memories

Highly detailed, exceptionally vivid 'snapshot' memories of the moment and circumstances in which surprising and consequential (or emotionally arousing) news was heard.

Rehearsed

Practiced or gone over in preparation, typically to improve performance or memorization.