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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
- If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part
- In Young’s experiment, the third bright band for light of wavelength 6000Å
- Two bulbs 60 W and 100 W designed for voltage 220 V are connected in series
- The periodic waves of intensities I₁ and I₂ pass through a region at the same time
- A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth
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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