Q. Which of the following will not shift the center of mass?

निम्नलिखित में से कौन द्रव्यमान का केंद्र स्थानांतरित नहीं करेगा?

A
Removing a part of object
वस्तु का एक भाग हटाना
B
Changing shape
आकार बदलना
C
Adding external mass
बाह्य द्रव्यमान जोड़ना
D
Rotating the object
वस्तु को घुमाना

Explanation

The center of mass (CM) depends only on the distribution of mass. Rotation of the object does not change this distribution relative to itself—it merely changes orientation in space. So, rotating the object does not shift the CM.
In contrast:

  • Removing a part changes the mass distribution.

  • Changing shape alters how mass is spread.

  • Adding mass changes the overall mass balance.

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