Sebastian Has Drawn a Free-Body Diagram for a Ladder of Mass

question 32

Multiple Choice

Sebastian has drawn a free-body diagram for a ladder of mass m leaning against a frictionless wall. His diagram is shown below. What is his error? ​ ​

• A) is in the wrong direction.
• B) should be directed upwards, not down.
• C) should be perpendicular to the wall, not parallel to it.
• D) should be down into the floor for to have the given direction.
• E) is correct, but there should also be a force perpendicular to the wall.

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Definitions:

Marginal Product

The additional output resulting from the use of one more unit of a production input, holding other inputs constant.

Variable Input

A variable input is one whose amount can be adjusted in the short term to either raise or lower output levels.

MRP

Acronym for Marginal Revenue Product, which measures the addition to total revenue resulting from the sale of the output produced by one more unit of a variable input.

Haircuts

Often used as an example in economics, referring to a service that cannot be stored, saved, or inventoried, and must be consumed at the point of production.