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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?

Solution

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.

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?

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