| ⇦ | 
| ⇨ |
The angle between the vectors (i+j) and (j+k) is
Options
(a) 90⁰
(b) 60⁰
(c) 30⁰
(d) 45⁰
Correct Answer:
60⁰
Explanation:
A = i + j, B = j + k
A . B = |A| |B| cos θ
where θ is the angle between two vectors A and B.
.·. A.B = (i + j).(j + k) = 1
|A| = √(1² + 1²) = √2,
|B| = √(1² + 1²) = √2
.·. cos θ = A.B / |A| |B| = 1/(√2×√2) = 1/2
θ = cos⁻¹ (1/2) = 60⁰
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Topics: Motion in Plane
(93)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A ball is thrown vertically downwards from a height of 20 m with an initially
- A stationary particle explodes into two particles of masses m₁ and m₂ which move
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- The frequency of an alternating voltage is 50 cycles per second and its amplitude
- If an A.C. mains supply is given to be 220 V, what would be the average e.m.f.
Topics: Motion in Plane (93)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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