A Locomotive Moving at a Constant Speed Approaches and Then

question 19

Multiple Choice

A locomotive moving at a constant speed approaches and then passes a man standing at a crossing.The frequency of the locomotive's horn as the man hears it

• A)gradually increases and then decreases.
• B)gradually decreases and then increases.
• C)abruptly changes as the locomotive passes.
• D)does not change at all.
• E)produces beats due to the Doppler effect.

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Definitions:

Economic Profit

The difference between the total revenue earned by a business and the total opportunity costs of all resources used in production.

Competitive

Relating to or characterized by rivalry among sellers in a market, aiming to increase sales, market share, and customer loyalty by offering better terms.

Maximum

The highest or greatest possible amount or degree of something.

Long-Run Equilibrium

A state in which all factors of production and inputs in a market are fully adjusted to any economic changes, showing no tendency for further adjustment.