A 50-Kg Crate Is Resting on a Horizontal Plank

question 28

Multiple Choice

A 5.0-kg crate is resting on a horizontal plank.The coefficient of static friction is 0.50 and the coefficient of kinetic friction is 0.40.After one end of the plank is raised so the plank makes an angle of 30° with the horizontal, the force of friction is:

• A)0 N
• B)17 N
• C)20 N
• D)25 N
• E)49 N

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Definitions:

Hemoglobin

A molecule found in red blood cells responsible for transporting oxygen from the lungs to the tissues throughout the body and bringing carbon dioxide from those tissues back to the lungs.

Metabolism

This is the set of life-sustaining chemical reactions in organisms, involving the conversion of food to energy, the elimination of nitrogenous wastes, and the synthesis of necessary compounds.

Triglycerides

A type of fat found in the blood, originating from foods or produced by the body, used for energy storage.

Fatty Acids

Long-chain hydrocarbons found in fats and oils that are sources of energy, important in diet and metabolism.