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Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are v and 2v at any instant, then the speed of centre of mass of the system will be:
Options
(a) 2v
(b) zero
(c) 1.5
(d) v
Correct Answer:
zero
Explanation:
If no external force actson a system of particles, the centre of mass remains as rest. So, speed of centre of mass is zero.
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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
- A 1 kg particle strikes a wall with velocity 1 m/s at an angle 30° and reflects
- Steam at 100⁰C is passed into 20 g of water at 10°C. When water acquires a temperature
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
- Two coherent monochromatic beams of intensities I and 4I respectively, are superposed.
- A long wire carrying a steady current is bent into a circular loop of one turn.
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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