question_answer

Forces 5N, 12N and 13N are in equilibrium If \[1\text{ }km/h\]. then the angle between 5N force and 13N force is

A)  \[\text{3 }km/h\]                                           

B)  \[\text{4 }km/h\]

C)  \[\text{5 }km/h\]                                           

D)  \[{{10}^{-6}}{{m}^{2}}\]

Correct Answer: B

Solution :

                As  \[{{5}^{2}}+{{12}^{2}}={{13}^{2}}\], so these forces will be acting along the side of a right angled triangle. Angle between 5N and 13N. \[={{180}^{o}}-({{90}^{o}}+{{23}^{o}})\] \[={{67}^{o}}\]