Question

A drawing pin is pushed against a wooden table with a force of 10 N. Calculate the pressure exerted by the pin at a point on the table, if area of the point is 0.01 $c{m}^2$.

• A. ${10}^{5}Pa$
• B. ${10}^{6}Pa$
• C. ${10}^{7}Pa$
• D. ${10}^{8}Pa$

Answer 1

The correct option is C ${10}^{7}Pa$

Force, $F=10N$
$Area,A=0.01c{m}^2=\frac{0.01}{10000}{m}^2$
$=\frac{1}{10,000\times 100}{m}^2=\frac{1}{{10}^{-6}}{m}^2={10}^{-6}{m}^2$
$\therefore P=\frac{F}{A}=\frac{10}{{10}^{-6}}Pa=10\times {10}^{6}Pa$
$={10}^{7}Pa$