Laws Of Motion Question 80

Question: The resultant of two forces, one double the other in magnitude, is perpendicular to the smaller of the two forces.The angle between the two forces is [KCET 2002]

Options:

A) 60∘

B) 120∘

C) 150∘

D) 90∘

Show Answer

Answer:

Correct Answer: B

Solution:

tan⁡α=2Fsin⁡θF+2Fcos⁡θ=∞ (asα=90∘ ) thereforeF+2Fcos⁡θ=0 thereforecos⁡θ=−12

θ=120∘

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