Physics and Measurement: Base vs Derived Quantities
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Questions and Answers

Which of the following is a base quantity?

  • Length (correct)
  • Volume
  • Pressure
  • Density
  • What is the SI unit for mass?

  • Pound
  • Newton
  • Kilogram (correct)
  • Gram
  • Which physical quantity cannot be derived from other base quantities?

  • Acceleration
  • Density
  • Velocity
  • Time (correct)
  • What is the purpose of dimensional analysis?

    <p>To check equations for consistency</p> Signup and view all the answers

    The SI unit of length, the meter, was redefined based on:

    <p>The distance traveled by light in vacuum during a specific time interval</p> Signup and view all the answers

    Physical quantities can only be measured using a scale.

    <p>False</p> Signup and view all the answers

    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.

    <p>True</p> Signup and view all the answers

    The second is defined as 9 192 631 700 times the period of oscillation of radiation from the cesium atom.

    <p>True</p> Signup and view all the answers

    Dimensional analysis is used to derive relationships between physical quantities.

    <p>True</p> Signup and view all the answers

    The equation $s = vt + 0.5at^2$ is dimensionally consistent.

    <p>False</p> Signup and view all the answers

    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.

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    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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