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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 spherical conductor of radius 2 m is charged to a potential of 120 V. It is now
- Laser light is considered to be coherant because it consists of
- A rectangular copper coil is placed in a uniform magnetic field of induction 40 mT
- An A.C source is rated at 220 V, 50 Hz. The time taken for voltage to change
- The ratio of magnetic dipole moment of an electron of charge e and mass m
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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