Question

Un corp cu masa de 60kg exercita, datorita greutatii lui o presiune de 15 000 Pa. Ce marime are suprafata pe care se sprijina corpul? ( se da g=10 N/ Kg )

Answer 1

$p=\frac{F}{S} \\\\F=m*a \\\\\\ p\to presiunea \\ F\to forta \ (gravitationala) \\ S\to suprafata \\ m\to masa \\ a\to acceleratia \ (gravitationala \ [g]) \\\\\\ S= \frac{F}{p} \ \ \ \ \ \ \ \ S=\frac{m*a}{p} \\\\ S= \frac{60kg*10 \frac{N}{kg}}{15.000\ Pa} \\\\ S= \frac{ 600N}{15.000 \frac{N}{m^2}} \\\\ S= \frac{6}{150}\frac{N}{1}* \frac{m^2}{N} \\\\ S= \frac{1}{25} m^2 \\\\ \boxed{S=0,04 m^2}$