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Units and Measurement
Question
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Does the position of centre of mass of rigid body change w.r.t. body when in motion?

Answer

No, with respect to the motion of the body, the centre of mass of the rigid body does not change. 

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Some More Questions From Units and Measurement Chapter

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?