A Ceiling Fan Is Turned on and Reaches an Angular

question 49

Multiple Choice

A ceiling fan is turned on and reaches an angular speed of 110 rev/min in 20 s.It is then turned off and coasts to a stop in an additional 60 s.The ratio of the average angular acceleration for the first 20 s to that for the last 60 s is which of the following?

• A) ​-0.3
• B) -3
• C) ​3
• D) ​0.3
• E) ​1.4

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Definitions:

Productive Efficiency

Productive efficiency occurs when an economy is operating at its maximum capacity, producing goods and services at the lowest possible cost per unit.

Marginal-Cost-Marginal-Benefit Rule

The marginal-cost-marginal-benefit rule states that optimal decision-making occurs when the marginal cost of an action equals its marginal benefit, ensuring efficient resource allocation.

Optimal Project Size

The most efficient scale of a project, considering factors like cost, resources, and expected benefits, to achieve the best possible outcome.

Marginal Costs

The cost uplift realized by the manufacture of an extra unit of a product or service.