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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
- A bar magnet of pole strength 10 A-m is cut into two equal parts breadthwise.
- The length of second pendulum is 1 m on earth. If mass and diameter
- A man throws balls with the same speed vertically upwards one after the other
- The velocity of electromagnetic radiation in a medium of permittivity ε₀
- A rectangular coil of length 0.12 m and width 0.1 m having 50 turns of wire
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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