Questions and Answers
In what year was the 14th General Conference on Weights and Measures held?
What is the abbreviation of the International System of Units?
What is the popular name of the International System of Units?
How many physical quantities were chosen as basic quantities in the International System of Units?
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Where was the 14th General Conference on Weights and Measures held?
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What is the property that all bodies have?
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What is mass a quantitative measure of?
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What is the term used to describe the resistance to a change in motion?
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Which of the following is NOT a correct statement about mass?
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What determines the amount of resistance an object exhibits to a change in its motion?
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What does SI stand for in the context of measurement systems?
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Which of the following is the SI unit for force?
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Which base units are used to define the SI unit for force?
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Which of the following is NOT a component of the International System of Units?
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What is the common name for the International System of Units?
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What is the purpose of using prefixes in the International System of Units (SI)?
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What is the SI prefix for 10^6?
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What is the SI prefix for 10^-9?
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What is the equivalent of 1.23 × 10^6 N in terms of SI prefixes?
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What is the equivalent of 1.23 × 10^-9 s in terms of SI prefixes?
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Which system of units is still used in the United States despite the widespread adoption of SI?
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Which of these is NOT a unit of force in the British engineering system?
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What is the main advantage of using SI prefixes?
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What is the SI unit for temperature?
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Which of the following best describes density?
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Which of the following is NOT a fundamental physical quantity?
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What is the definition of energy?
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What are the fundamental physical quantities?
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Study Notes
International System of Units (SI)
- The International System of Units (SI) has seven fundamental physical quantities chosen as base units in 1971 at the 14th General Conference on Weights and Measures in France.
- These quantities form the basis of the International System of Units, also known as the metric system.
Fundamental Physical Quantities
- The seven fundamental physical quantities are listed in Table 1 with their unit names and symbols.
Derived Units
- Many SI derived units are defined in terms of the first three quantities of Table 1.
- Example: the SI unit for force, called the newton (N), is defined in terms of the base units of mass, length, and time.
Prefixes
- SI uses prefixes to express large or small numbers in physics.
- Each prefix represents a certain power of 10.
- Examples of prefixes include mega (10^6) and nano (10^-9).
Expressing Magnitudes
- Using prefixes, magnitudes can be expressed in a more concise way.
- Example: 1.23 × 10^6 N = 1.23 mega newtons = 1.23 MN.
- Example: 1.23 × 10^-9 s = 1.23 nano seconds = 1.23 ns.
Conventional Unit System
- In addition to SI, another system of units, the British engineering system (or conventional system), is still used in the United States.
Physical Properties
- Mass is a quantitative measure of inertia or the resistance to a change in motion.
- All bodies have the property of resisting change in their motion.
Definitions
- Density is defined as mass per unit volume.
- Energy and mass are defined, but no specific definitions are provided in the text.
Questions
- The SI unit for temperature is not specified in the text.
- Questions 1-5 are listed, but the answers are not provided in the text.
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Description
Learn about the seven fundamental physical quantities chosen as the basis of the International System of Units, also known as the metric system.