Question

Ex 6.16 plss. Maine am test si nici probleme simple nush sa fac...niste explicatii daca se poate, va rog mult

Answer 1

[tex]\tt Se~da:\\ \\ \triangle l_{1}=2cm=0,02m\\ \\ m=400g=0,4kg\\ \\ \triangle l_{2}=3cm=0,03m\\ \\ L_{2}=?J\\ \\ \\ Formule:\\ \\ L_{2}=\frac{k \times \triangle l_{2}^{2}}{2}\\ \\ \\ F_{el_{1}}=G\\ \\ k \times \triangle l_{1}= m \times g\\ \\ k=\frac{m \times g}{\triangle l_{1}}\Rightarrow L_{2}=\frac{m \times g \times \triangle l_{2}^{2}}{\triangle l_{1} \times 2}\\ \\ \\ Calcule:\\ \\ L_{2}=\frac{0,4 \times 10 \times 0,03^{2}}{0,02 \times 2}=0,09J\\ \\ [/tex]