In the Figure, a Constant External Force P = 160

question 49

Multiple Choice

In the figure, a constant external force P = 160 N is applied to a 20.0-kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. The work done by friction during this process is closest to

• A) -1040 J.
• B) +1110 J.
• C) +1170 J.
• D) +1040 J.
• E) -1170 J.

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Definitions:

Marginal Cost

The additional cost incurred by producing one more unit of a product or service.

Shut Down

A short-term decision by a firm to cease operations when variable costs exceed revenues, typically in a perfect competition scenario.

Short Run

A time period in economics during which at least one factor of production is fixed, limiting the ability of the economy or firm to fully adjust.

Long Run

A period in which all factors of production and costs are variable, allowing full adjustment to any change.