While Standing at a Crosswalk,you Hear a Frequency of 540

question 29

Multiple Choice

While standing at a crosswalk,you hear a frequency of 540 Hz from an approaching police car.After the police car passes,its frequency is 480 Hz.What is the speed of the police car? (speed of sound = 340 m/s)

• A) 13.1 m/s
• B) 17.4 m/s
• C) 20.0 m/s
• D) 26.2 m/s

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Definitions:

Preferences

Refers to the subjective tastes and desires of consumers which influence their choices and decision-making in purchasing goods and services.

Political Logrolling

A practice where politicians exchange favors by supporting each other's proposals or policies.

Vote Trading

An agreement between two or more parties to swap votes on issues of mutual interest, to achieve a desired outcome for both sides.

Efficient

The optimal use of resources to achieve the desired outcome with minimal waste or expense.