Question

URGENT VA ROG

6. O forta F = 250 N actioneaza asupra unei suprafete de arie S = 4 cm², ca in figura.
Calculati valoarea presiunii exercitata de forta in Pa, torr si atm.

Answer 1

$\vec{F}=250 \ N \\ S=4 \ cm^2=0,0004 \ m^2 \\ \alpha=60^o \\ \vec{F}=pS\cos \alpha \\ \Rightarrow p=\frac{\vec{F}}{S\cos \alpha}=\frac{250 \ N}{0,0004 \ m^2 \cdot \sin 60^o}\\ \Righatrrow p=\frac{250 N}{0,0004 \ m^2 \cdot 0,5}=\frac{250 \ N}{0,0002 \ m^2} \\ \Rightarrow \boxed{p=1 \ 250 \ 000 \ Pa}; \\ \Rightarrow \boxed{p=9 \ 375,77 \ torr}; \\\Rightarrow \boxed{p=12,34 \ atm}.$