A Child Pulls a 3

question 18

Multiple Choice

A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 30.0° above horizontal. The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s², what is the coefficient of friction between the sled and the ground?

• A) 0.161
• B) 0.188
• C) 0.0441
• D) 0.0851
• E) 0.103

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Definitions:

Emergency Situation

Often involves an unusual event, can vary in nature, is unplanned and requires a quick response.

Bystander-Calculus Model

A theoretical model explaining the calculations individuals make before deciding to intervene or act in emergency situations.

Time and Effort

The amount of duration and physical or mental exertion invested into doing something.

Costs of Helping

refers to the potential negative consequences or sacrifices one might face when providing aid or support to others.