Questions
The resultant of two forces, one double of the other magnitude, is perpendicular to the smaller of two forces. The angle between the two force is
a
60°
b
120°
c
150°
d
90°
detailed solution
Correct option is B
See figure. P and Q (2P) are two forces and their resultant is R. The angle between P and Q is α.From figure, cosθ=PQ=P2P=12∴θ=cos−112=60∘So,α=180∘−60∘=120∘Talk to our academic expert!
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When two vectors of magnitudes ‘a’ and ‘b’ respectively are added, the magnitude of resultant vector is always
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