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خطا

$\eqalign{& {{\vec T}_1} + {{\vec T}_2} = {{\vec T}_R}  \cr & {{\vec T}_R} + \vec W = 0 \Rightarrow \left| {{{\vec T}_R}} \right| = \left| {\vec W} \right| = 40N  \cr & L = \sqrt {{{120}^2} + {{40}^2}}  = 40\sqrt {{3^2} + {1^2}}  = 40\sqrt {10} cm  \cr & \operatorname{Cos} \alpha  = \frac{{120}}{{40\sqrt {10} }} = \frac{{{T_2}}}{{{T_R}}} \Rightarrow \frac{3}{{\sqrt {10} }} = \frac{{{T_2}}}{{40}} \Rightarrow {T_2} = \frac{{3 \times 40}}{{\sqrt {10} }} = 12\sqrt {10} N \cr} $