statics

Question: Let R be the resultant of P and Q and if $\frac{P}{3}=\frac{Q}{7}=\frac{R}{5}$, then the angle between P and R is



1) ${{\cos }^{-1}}\left( \frac{11}{14} \right)$
2) ${{\cos }^{-1}}\left( \frac{-11}{14} \right)$
3) $\frac{2\pi }{3}$
4) $\frac{5\pi }{6}$
Solution: Explanation: No Explanation
Composition and resolution of forces and condition of equilibrium of forces

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