In a classroom demonstration, an 820 N student lies on a bed of sharp, evenly spaced, vertical nails. While the student is lying down, approximately 1650 nails make contact with his body.a) what is the average force exerted by each nail on the student's body?b) If the area of contact at the head of each nail is 1.05 x 10-6 m2, what is the average pressure at each contact?

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Asked Jul 25, 2019
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In a classroom demonstration, an 820 N student lies on a bed of sharp, evenly spaced, vertical nails. While the student is lying down, approximately 1650 nails make contact with his body.

a) what is the average force exerted by each nail on the student's body?

b) If the area of contact at the head of each nail is 1.05 x 10-6 m2, what is the average pressure at each contact?

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Step 1

(a)

The average force exerted by the nail on the student’s body is,

Here, W is the total weight of the student and N is the number of nails making contacts with the body.

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F ag N

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Step 2

Substituting the values,

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820N ag 1650 0.497N

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Step 3

(b)

The average pressure make in contac...

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F avE A

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