Editor Staff asked 1 year ago
Three identical spheres each of radius R are placed such that their centres lie on a straight line. What is the location of their centre of mass from the centre of the first sphere?
(a) R
(b) 2R
(c) 3R
(d) 4R
I got this question at a job interview.
The doubt is from System of Particles topic in section System of Particles and Rotational Motion of Physics – Class 11
Select the correct answer from above options
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Editor Staff answered 1 year ago
The correct answer is (b) 2R
To elaborate: Distance between first and last sphere = R + 2R + R = 4R
Since the spheres are identical and lie in a straight line, the centre of mass will lie exactly in the middle.
Hence the centre of mass lies at a distance of 2R from the centre of the first sphere.
