Posted by **Bill** on Tuesday, April 9, 2013 at 6:24am.

Person weighing 650N lies on a bed of nails,each nail has area of 1m2 Assume 4Nm^-2 pressure is painful what is the smallest number of nails they could lay on and not be hurt

- Science -
**Steve**, Tuesday, April 9, 2013 at 12:15pm
First, it's "lie" not "lay"

Next, surely a nail does not have an area of 1m^2.

Anyway, when you get a correct value for the area of a nail, say "a" m^2, just divide the weight by the number of nail areas, for n nails:

650N/(n*a) <= 4

n >= 162.5/a

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