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Units And Measurement

Question

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A body rotating about given axis with unit angular velocity has kinetic energy K. What is the moment of inertia of the rotating body about given axis?

Solution

Kinetic energy is given by,
$straight K space equals space 1 half I thin space straight omega squared$
Given, angular velocity, $straight omega$ = 1 rad/sec
So, moment of inertia of the rotating body is,
I = 2K

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.

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