Kinematics Question 7
Question: Two forces, each of magnitude F have a resultant of the same magnitude F. The angle between the two forces is [CBSE PMT 1990]
Options:
A) $ 45{}^\circ $
B) $ 120{}^\circ $
C) $ 150{}^\circ $
D) $ 60{}^\circ $
Correct Answer: B $ R=\sqrt{A^{2}+B^{2}+2AB\cos \theta } $ By substituting, $ A=F, B=F $ and $ R=F $ we get $ \cos \theta =\frac{1}{2}\therefore \theta =120{}^\circ $
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