A student presses her palm by her thumb with a force

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Editor

Jun 23, 2022

A student presses her palm by her thumb with a force of 75 N. How much would the pressure under her thumb have a contact area of $1.5 cm^{2}$? $(5\times105 Nm^{-2})$

Solution:         Force = F = 75 N                       Contact Area A = $1.5 cm^{2}$ = $1.5 \times \frac{1}{100}\times\frac{1}{100}  m^{2}$ = $1.5 \times 10^{-4} m^{2}$                        Pressure under the thumb = P =?                        P =$\frac{F}{A}$                         P  =$\frac{75}{(1.5 × 10^(-4))}$ = $\frac{75}{1.5 \times 10^{-4}}$= $5 \times 10^{5} Nm^{-2}$