Question

Calculate the pressure exerted by a man weighing 85 kg standing on a piece of tile. The dimensions of his feet are 30.2 cm x 15 cm.

• A. $20,825N/m^2$
• B. $2,458N/m^2$
• C. $21,754N/m^2$
• D. $28,456N/m^2$

Answer 1

The correct option is A $20,825N/m^2$

Mass of the man = 85kg.
The weight of the man applies thrust on the tile.
$\therefore$ Trust $=F=m\times g=85\times 9.8=833N$
Area of feet (considering a rectangular area) $=l\times b=30.2cm\times 15cm$
$=453c{m}^2$
$=0.04m^2$
Pressure $=\frac{Thrust}{Area}=\frac{833}{0.04}=20825N/m^2$