A Box That Weighs 300 N Is Pulled by a Rope

question 48

Multiple Choice

A box that weighs 300 N is pulled by a rope across a level surface with a constant velocity. The rope makes an angle of 30.0 degrees above the horizontal, and the tension in the rope is 100 N. What is the magnitude of the normal force from the floor on the box?

• A) 86 N
• B) 300 N
• C) 50 N
• D) 250 N
• E) 0 N

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Definitions:

Zygotes

The initial cell formed when a sperm cell fertilizes an egg cell, representing the earliest stage of development in many organisms.

Allostasis

“Balance through adaptation.” In this model of stress processes, the central nervous system (CNS) controls multiple interacting regulatory processes so that the best balance for each specific challenge is found, rather than returning to a fixed set point.

General Adaptation Syndrome

A model that describes the body's short-term and long-term reactions to stress, developed by Hans Selye.

Set-Point Model

A theory in psychology that suggests individuals have a pre-set level of happiness or well-being, which is largely stable over time despite changes in circumstances.