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Questions and Answers
What are the two parts of every measurement?
What are the two parts of every measurement?
- Quantity and scale
- Magnitude and unit
- Value and dimension
- Number and unit (correct)
In the SI system, what is a coherent system of units?
In the SI system, what is a coherent system of units?
- One in which the units are determined by international consensus
- One in which the units are universally accepted
- One in which the units of derived quantities are obtained as multiples or submultiples of certain basic units (correct)
- One in which the units are based on natural phenomena
What does the numerical value of a physical quantity express?
What does the numerical value of a physical quantity express?
- Intensity
- Magnitude (correct)
- Dimension
- Scale
What does Q = nu represent?
What does Q = nu represent?
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What is the relationship between n1u1 and n2u2 for a physical quantity?
What is the relationship between n1u1 and n2u2 for a physical quantity?
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Study Notes
Measurement Fundamentals
- Every measurement consists of two parts: a numerical value and a unit of measurement.
- A coherent system of units is one in which the units of measurement for different physical quantities are related to each other in a consistent manner, as in the SI system.
Physical Quantities
- The numerical value of a physical quantity expresses its magnitude or amount.
- The equation Q = nu represents the relationship between a physical quantity (Q) and its numerical value (n) and unit of measurement (u).
Physical Quantity Relationships
- For a physical quantity, the relationship between n1u1 and n2u2 is one of equivalence, where n1u1 = n2u2.
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