While Spinning Down from 500 Rpm to Rest, a Flywheel $3.9 \mathrm {~kJ}$

question 90

Multiple Choice

While spinning down from 500 rpm to rest, a flywheel does $3.9 \mathrm {~kJ}$ of work. This flywheel is in the shape of a solid uniform disk of radius 1.2 m. What is the mass of this flywheel?

• A)4.0 kg
• B)3.4 kg
• C)4.6 kg
• D)5.2 kg

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Definitions:

Id

In Freudian psychology, the part of the human psyche that is the source of instinctual impulses and demands for immediate satisfaction of primitive needs.

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Laptop

A portable personal computer with a clamshell form factor, suitable for mobile use and equipped with a keyboard and screen.

Id

In psychoanalytic theory, a part of the mind that is the source of instinctual impulses and demands for immediate satisfaction of basic needs.