Question

va rogg frumoss repedeee​

Answer 1

Valoare min: R=|F1-F2|

Valoare max:  R=F1+F2

|F1-F2|=1

F1+F2=7

Adunam cele doua si avem:

2*F1=8 => F1=4N;

4+F2=7 => F2=3N;

$R=\sqrt{(F1^{2}+F2^{2}+2cosa*F1*F2 } \\=\sqrt{(4^{2}+3^{2}+2cos90*4*3 } \\=\sqrt{(25+2*0*4*3) } \\=\sqrt{25} \\=5N$