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Two bodies of mass 1 kg and 3 kg have positive vectors i + 2j + k and -3i -2j + k respectively. The centre of mass of this system has a position vector:
Options
(a) -2i – j + k
(b) 2i – j – 2k
(c) -i + j + k
(d) -2i + 2k
Correct Answer:
-2i – j + k
Explanation:
The position vector of othe centre of mass of two particle system is given by
R⃗ = m₁R⃗₁ + m₂R⃗₂ / (m₁ + m₂)
= 1/4 [-8i -4j + 4k] = -2i -j + k
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Topics: Motion of system of Particles and Rigid Body
(73)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Photoelectric emision occurs only when the incident light has more than a certain minimum
- When two identical capacitors are in series, they have 3 μF capacitance
- Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
- A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects
- A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance
Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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