First Law of Thermodynamics
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Questions and Answers

According to the first law of thermodynamics, what are the two principal forms of energy transfer?

  • Heat and thermodynamic work (correct)
  • Thermodynamic work and nuclear energy
  • Heat and sound
  • Heat and light
  • What is the equivalent statement of the first law of thermodynamics in terms of perpetual motion machines?

  • Perpetual motion machines are possible
  • Perpetual motion machines require external energy only
  • Perpetual motion machines are sustainable
  • Perpetual motion machines of the first kind are impossible (correct)
  • In an isolated system, what is constant according to the first law of thermodynamics?

  • Work only
  • Heat only
  • Matter only
  • Sum of all forms of energy (correct)
  • What type of system often serves as a model for the ideal isolated system in thermodynamics?

    <p>The entire universe</p> Signup and view all the answers

    When considering practical applications, what concept does thermodynamics define in addition to closed systems?

    <p>Open systems</p> Signup and view all the answers

    Which principal forms of energy transfer does the first law of thermodynamics distinguish?

    <p>Heat and thermodynamic work</p> Signup and view all the answers

    What does the first law of thermodynamics define as an extensive property for taking account of the balance of heat and work in a system?

    <p>Internal energy</p> Signup and view all the answers

    What does the first law of thermodynamics state?

    <p>Energy cannot be created or destroyed, but it can be transformed from one form to another in an isolated system</p> Signup and view all the answers

    In practical applications, what concept does thermodynamics define in addition to closed systems?

    <p>Open systems</p> Signup and view all the answers

    According to the first law of thermodynamics, what is constant in an isolated system?

    <p>The sum of all forms of energy</p> Signup and view all the answers

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