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Reading Time from an Analog Clock

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Question

What are the three requirements for selecting a unit of a physical quantity?

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Solution

Three requirements for selecting a unit are
1. The unit should be reproducible.
2. It should be possible to define the unit without ambiguity.
3. The value of the unit should not change with space and time.

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What are the three requirements for selecting a unit of a physical quantity?

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Reading Time from an Analog Clock

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