In a Classroom Demonstration,a 79

question 39

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.
-What is the average force exerted by each nail on the professor's body?

• A)0.201 N
• B)0.398 N
• C)1.42 N
• D)0.809 N
• E)142 N

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