1.
F₂ = 10 N (←)
F₁ = 7 N (→)
Fw = F₂ - F₁ = 10 N - 7 N = 3 N (←)
1 N
|----|
F₂ F₁
<----------------------------------------₀--------------------------->
Fw
<------------
2.
[tex]dane:\\m = 120 \ kg\\d = 0,06\frac{g}{cm^{3}}=0,06\cdot\frac{0,001 \ kg}{0,000001 \ m^{3}} = \frac{0,06 \ kg}{0,001 \ m^{3}} = 60\frac{kg}{m^{3}}\\szukane:\\V = ?\\\\d = \frac{m}{V} \ \ \Rightarrow \ \ V = \frac{m}{d}\\\\V = \frac{120 \ kg}{60\frac{kg}{m^{3}}} =2 \ m^{3}}[/tex]
