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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 cell of emf E and internal resistance r supplies current for the same time
- A spherical planet has a mass Mp and diameter Dp. A particle of mass
- A carnot engine working between 300 K and 600 K has a work output of 800J per cycle.
- In a potentiometer experiment two cells of e.m.f. E₁ and E₂ are used in series
- The value of coefficient of volume expansion of glycerin is 5 x 10⁻⁴ k⁻¹.
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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