Question

The two thigh bones (femures), each of cross-sectional area $10c{m}^2$ support the upper part of a person of $50kg$. The average pressure sustained by femures is

• A. $2.5\times {10}^{5}N/m^2$
• B. $4\times {10}^{5}N/m^2$
• C. $5\times {10}^{5}N/m^2$
• D. ${10}^{6}N/m^2$

Answer 1

The correct option is A $2.5\times {10}^{5}N/m^2$

$\begin{array}{c}\text{Total force applied on femures}=50\times 10\\ =500N\\ \text{. Force on each fenur}=250N\\ \text{Average pressive on each femwr}\\ =\frac{250}{10\times {10}^{-4}\frac{N}{m^2}}\\ =\frac{2.5\times {10}^{-5}N}{m^2}\end{array}$