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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 name of ions knocked out from the hot surface is
- If voltage across a bulb rated 220 volt-100 Watt drops by 2.5% of its rated value
- A carbon film resistor has colour code green, black, violet, gold. The value
- An ideal gas expands in such a manner that its pressure and volume can be related
- During mean life of a radioactive element, the fraction that disintegrates is
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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