Q. The resultant of two forces acting at an angle of $120{^\circ}$ is 10 kg-wt and is perpendicular to one of the forces. That force is
A) $\frac{10}{\sqrt{3}}\ kg–wt$
B) 10 kg-wt
C) $20\sqrt{3}\ $kg-wt
D) $10\sqrt{3}\ $kg-wt
Explanation
(a) $\tan{30{^\circ} = \frac{1}{\sqrt{3}} = \frac{x}{10}}$
$x = \frac{10}{\sqrt{3}}$
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Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.