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Units and Measurement
Question
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Does the angular momentum of a planet revolving around a star remain constant over the entire orbit even if the orbit is highly elliptical?

Answer

Yes, the angular moment of a planet revolving around the star remains conserved. The angular momentum lost os gained by the sun and vice versa. Hence, angular momentum always remains conserved. 

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Some More Questions From Units and Measurement Chapter

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?

How many fundamental quantities are there in Physics?