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If two vectors are equal in magnitude and their resultant is also equal in magnitude to one of them, then the angle between the two vectors is
Options
(a) 60°
(b) 120°
(c) 90°
(d) 0°
Correct Answer:
120°
Explanation:
The angle θ between the vector A and B
Using the cosine rule, R² = A²+B²-2AB cosθ
Where R=A=B, then
R² = R²+R²-2RR cosθ
cosθ = -1/2
θ = 120°.
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Topics: Motion in Plane
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The total kinetic energy of a body of mass 10 kg and radius 0.5 m moving with a velocity
- The phase difference between the instantaneous velocity and acceleration of a particle
- Masses of 3 wires of same metal are in the ratio 1:2:3 and their lengths
- A bubble is rising from bottom of a lake. The volume of bubble becomes
- A wave in a string has an amplitude of 2cm. The wave travels in the positive direction
Topics: Motion in Plane (93)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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