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Units And Measurement

Question

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If we shift the axis parallel to it, about which axis the moment of inertia of body is least?

Solution

According to theorem of parallel axis, the moment of inertia of a body about an axis parallel to axis passing through centre of mass of body is,

I = I_c + Mh²For an axis passing through the centre of mass of the body, minimum value of h is zero. Hence, the moment of inertia is minimum about this axis.

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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