10 Questions
Which of the following is a base quantity?
Length
What is the SI unit for mass?
Kilogram
Which physical quantity cannot be derived from other base quantities?
Time
What is the purpose of dimensional analysis?
To check equations for consistency
The SI unit of length, the meter, was redefined based on:
The distance traveled by light in vacuum during a specific time interval
Physical quantities can only be measured using a scale.
False
The SI unit of mass, the kilogram, is defined as the mass of a specific platinum–iridium alloy cylinder kept at the International Bureau of Weights and Measures at Sèvres, France.
True
The second is defined as 9 192 631 700 times the period of oscillation of radiation from the cesium atom.
True
Dimensional analysis is used to derive relationships between physical quantities.
True
The equation $s = vt + 0.5at^2$ is dimensionally consistent.
False
Study Notes
Base Quantities and SI Units
- Mass is a base quantity.
- The SI unit for mass is the kilogram (kg).
- The kilogram is defined as the mass of a specific platinum–iridium alloy cylinder kept at the International Bureau of Weights and Measures at Sèvres, France.
Time
- The second is defined as 9,192,631,700 times the period of oscillation of radiation from the cesium atom.
Dimensional Analysis
- Dimensional analysis is used to derive relationships between physical quantities.
- It is also used to check the consistency of equations, such as $s = vt + 0.5at^2$, which is dimensionally consistent.
Measuring Physical Quantities
- Physical quantities can be measured using different scales.
Redefining the Meter
- The SI unit of length, the meter, was redefined based on new standards.
Test your knowledge of physical quantities, including base and derived quantities, systems of units, and standards of length. Explore the fundamental concepts in physics and measurement.
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