The Two Masses in the Figure Are Released from Rest

question 27

Multiple Choice

The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?

• A)−12 J
• B)−17 J
• C)−20 J
• D)−8.0 J
• E)−28 J

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Definitions:

Oligopolistic Competition

A market structure in which a few large firms dominate the market, with limited competition between them.

Positive Sum Game

A situation in which all participants can gain or benefit in some way, in contrast to a zero-sum game where one's gain is exactly balanced by another's loss.

Herfindahl Index

A measure used to calculate the size of firms in relation to the industry and an indicator of the amount of competition among them; higher values indicate lesser competition.

Concentration Ratio

A measure used in economics to assess the level of competition in an industry by calculating the market share of the largest firms.