Question 1161861
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<pre>

1 Pa = 1 N / 1 m^2.


If d is the diameter of the hair, then


   {{{2*10^8}}}.{{{pi*(d^2/4)}}} = 1.1 N


which implies


    {{{d^2}}} = {{{(1.1*4)/(pi*2*10^8)}}} = {{{(1.1*4)/(2*3.14)}}}.{{{10^(-8)}}} m^2 = {{{0.7*10-8}}} m^2.


Hence,


    d = {{{sqrt(0.7*10^(-8))}}} = {{{0.84*10^(-4)}}} meters = 0.084 mm.    <U>ANSWER</U>
</pre>

Solved.


It is very easy. Having a bit of common sense is just enough.