A Person Pushes Horizontally on a Heavy Box and Slides

question 1

Multiple Choice

A person pushes horizontally on a heavy box and slides it across the level floor at constant velocity. The person pushes with a 60.0 N force for the first 6.88 m, at which time he begins to tire. The force he exerts then starts to decrease linearly from 60.0 N to 0.00 N across the remaining 6.88 m. How much total work did the person do on the box?

• A) 619 J
• B) 826 J
• C) 495 J
• D) 925 J

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Definitions:

Moon Illusion

The moon illusion is an optical illusion where the moon appears larger when it is close to the horizon than when it is higher in the sky, despite having the same actual size.

Horizon

The line at which the earth's surface and the sky appear to meet, or metaphorically, the limit of a person's knowledge, experience, or interest.

Elliptical

Having an oval shape or relating to an ellipse; also used metaphorically to describe speech or writing that is obscure or lacks completeness.

Perceptual Constancy

The brain's ability to perceive objects as unchanging despite changes in viewing conditions, such as distance or lighting.