Question

determina energia potentiala a unui resort deformat in timpul comprimarii luicu 2 cm , daca se stie ca pentru a-l comprima cu 1 cm, trebuie aplicata o forta de 30 N

Answer 1

$\Delta l_2=2 \ cm=0,02 \ m \\ \Delta l_1=10 \ cm=0,01 \ m \\ F_{e1}=30 \ N \\ \boxed{E_{p2}-?} \\ \bold{Rezolvare:} \\ \boxed{E_p=m \cdot g \cdot h}=G \cdot l =F_e \cdot \Delta l \\ \frac{E_{p1}}{E_{p2}} = \frac{\Delta l_1}{\Delta l_2} \ \ \ \ \Rightarrow E_{p2}= \frac{E_{p1} \cdot \Delta l_2}{\Delta l_1} \\ E_p_1=F_{e1} \cdot \Delta l_1 \\ E_{p1}=30 \ N \cdot 0,01 \ m \\ E_{p1}=0,3 \ J \\ E_{p2}= \frac{0,3 \ J \cdot 0,02 \ m}{0,01 \ m} = \frac{0,006 \ J \cdot m}{0,01 \ m} \\ \Rightarrow \boxed{E_{p2}=0,6 \ J}$