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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
- Huygen’s principle of secondary wavelets may be used to
- A high altitude, a body explodes at rest into two equal fragments with one fragment
- A and B are two vectors and θ is the angle between them ,if |A x B|=√3(A.B),the value of θ
- The optical path of a monochromatic light is same if it goes through 4.0 cm
- An unpolarised beam of intensity I is incident on a pair of nicols making an angle
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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