Question

Ex 1 va roggg ajutati ma

Answer 1

 $F_1=35 \ N \\ \Delta l_1=5 \ cm \\ F_2=7\ N \\ F_3=63 \ N \\ \Delta l_4=6 \ cm \\ \frac{F_1}{\Delta l_1}=\frac{F_2}{\Delta l_2}=\frac{F_3}{\Delta l_3}=\frac{F_4}{\Delta l_4} \\ \Rightarrow \frac{35 \ N}{5 \ cm}=\frac{7 \ N}{\Delta l_2}=\frac{63 \ N}{\Delta l_3}=\frac{F_4}{6\ cm} \\ \Rightarrow \Delta l_2=\frac{5 \ cm \cdot 7 \ N}{35 \ N}=\frac{5 \ cm}{5 }=\boxed{\bold{1 \ cm}} \\ \Rightarrow \Delta l_3=\frac{5 \ cm \cdot 63 \ N}{35\ N}=\frac{63 \ cm}{7 }=\boxed{\bold{9 \ cm}}$
 $\Rightarrow F_4=\frac{35 \ N \cdot 6 \ cm}{5 \ cm}=7 \ N \cdot 6 =\boxed{\bold{42 \ N}}$