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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 refractive index of water, glass and diamond are 1.33, 1.50, 2.40 respectively
- Electrical force is acting between two charges kept in vacuum. A copper plate
- The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon.
- Find out the angle of projection, if range is 4 times of maximum height
- A drum of radius R and mass M, rolls down without slipping along an inclined plane
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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