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Units and Measurement
Question
Wired Faculty App

Two persons jump from a spring board into a swimming pool. One person jumps straight and second person curls himself. Which of the two persons can make more revolutions before they hit the pool?

Answer

Second person will make more revolutions before they hit the pool because as the person curls up the moment of Inertia decreases. Therefore, the angular velocity of the person increases. 

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Some More Questions From Units and Measurement Chapter

Give four examples of physical quantities.

Define unit.

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.