A Rotating Flywheel Can Be Used as a Method to Store

question 7

Multiple Choice

A rotating flywheel can be used as a method to store energy. If it has 2.0 * 10⁶ J of kinetic energy when rotating at 400 rad/s, and if a frictional torque of 4.0 N m acts on the system, in what interval of time would the flywheel come to rest?

• A) 3.5 min
• B) 42 min
• C) 14 min
• D) 21 min

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Definitions:

Ivory

A hard, white material from the tusks (mainly elephants') and teeth of animals, used historically for art, decoration, and utilitarian items.

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A material usually made from water, gypsum, or lime, used in building and art for coating, decorating, and molding smooth, hard surfaces.

Pre-Justinianic Byzantine Art

Art from the early Byzantine Empire before the reign of Emperor Justinian I, characterized by Christian religious concepts and Hellenistic influences.

Hagia Sophia

An architectural masterpiece originally built as a Christian cathedral in Constantinople (modern-day Istanbul, Turkey) and later converted into a mosque, now a museum.