Physics System of Particles Rotational Motion Karnataka - CET Previous Year Question MCQ (Single Correct)

The centre of mass of an extended body on the surface of the earth and its centre of gravity

A
can never be at the same point
B
are always at the same point for any size of the body
C
centre of mass coincides with the centre of gravity of a body if the size of the body is negligible as compared to the size (or radius) of the earth
D
are always at the same point only for spherical bodies.

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Text Solution

Verified by Experts
The correct answer is:
C

: An object is said to be small if its vertical height is very small compared to the radius of the earth. If the vertical height of the object cannot be neglected as compared to the radius of the earth then the object is said to be extended. In case of a building and a pond, the centre of gravity coincides with the centre of mass. A deep lake and a mountain are extended objects. So, their centre of gravity and centre of mass differ.

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