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Three masses are placed on the x-axis : 300 g at origin, 500 g at x = 40 cm and 400 g at x = 70 cm. The distance of the centre of mass from the origin is:
Options
(a) 40 cm
(b) 45 cm
(c) 50 cm
(d) 30 cm
Correct Answer:
40 cm
Explanation:
Xcm = m₁x₁ + m₂x₂ + m₃x₃ / m₁ + m₂ + m₃
Xcm = 300 x (0) + 500 x (40) + 400 x 70 / 1200
Xcm = 500 x 40 + 400 x 70 / 1200
Xcm = 50 + 70 / 3 = 120 / 3 = 40 cm
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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
- The half life of radium is about 1600 year. Of 100 gram of radium existing now
- A transistor-oscillator using a resonant circuit with an inductor L
- Certain quantity of water cools from 70⁰ C to 60⁰C in the first 5 minutes and to 54⁰C
- When ultraviolet rays are incident on metal plate, then photoelectric effect
- Two sound waves of wavelengths 5m and 6m formed 30 beats in 3 seconds
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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