A Box Is Moved 20 M Across a Smooth Floor

question 33

Multiple Choice

A box is moved 20 m across a smooth floor by a force making a downward angle with the floor, so that there is effectively a 10 N force acting parallel to the floor in the direction of motion and a 5 N force acting perpendicular to the floor. The work done is

• A) 300 J.
• B) 200 J.
• C) 100 J.
• D) 20 J.
• E) 5.0 J.

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Definitions:

Coefficient of Determination

A statistical measure, often denoted as \(R^2\), that represents the proportion of the variance in the dependent variable that is predictable from the independent variables.

Dependent Variables

In statistics and experiment design, these are the variables being tested and measured, expected to change as a result of manipulations to the independent variables.

Independent Variables

Variables in an experiment or study that are manipulated or categorized to observe their effect on dependent variables.

Coefficient of Multiple Correlation

A measure used in multiple regression analyses to assess the strength of the relationship between multiple independent variables and a single dependent variable.