Newton's Second Law: a 60

question 131

Multiple Choice

Newton's second law: A 60.0-kg person rides in an elevator while standing on a scale. The scale reads 400 N. The acceleration of the elevator is closest to

• A) 3.13 m/s² downward.
• B) 6.67 m/s² downward.
• C) zero.
• D) 9.80 m/s² downward.
• E) 6.67 m/s² upward.

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Definitions:

Mitral Valve

A valve in the heart that lets blood flow from the left atrium to the left ventricle, preventing backflow.

Tricuspid Valve

Valve closing the orifice between the right atrium and the right ventricle of the heart.

Pulmonary Semilunar Valve

A valve in the heart located between the right ventricle and the pulmonary artery, preventing backflow of blood into the heart.

Aortic Semilunar Valve

A valve in the heart that lies between the left ventricle and the aorta, preventing backflow of blood into the ventricle.