In a Classroom Demonstration, a 79

question 28

Multiple Choice

In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is lying down, approximately 1950 nails make contact with his body.
-If the area of contact at the head of each nail is 1.26 × 10^-6 m², what is the average pressure at each contact?

• A)1.58 × 10⁵ Pa
• B)1.27 × 10⁶ Pa
• C)2.40 × 10⁴ Pa
• D)4.82 × 10⁴ Pa
• E)3.16 × 10⁵ Pa

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Definitions:

Life Expectancy

The average period that a person may expect to live, based on statistical averages.

Mindfulness Meditation

A practice of mindfulness involving focusing the mind on the present moment without judgment, often used as a stress reduction technique.

Optimism

The tendency to expect the best possible outcome or to dwell on the most hopeful aspects of a situation.

Serotonin Activity

Refers to the actions and effects of serotonin, a key neurotransmitter, in the brain which impacts mood, feelings of well-being, and happiness.