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Units and Measurement
Question
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Which will be at greater height from the surface of the earth, for a 5 km tall body-centre of gravity or centre of mass?

Answer

Centre of mass will be at a greater height than the centre of gravity. For taller objects, the centre of gravity acts in such a way as to topple the object. So, the centre of mass is concentrated at a point higher so that the body does not topple. 

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Some More Questions From Units and Measurement Chapter

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?

How many fundamental quantities are there in mechanics?