Thermal Conductivity of Materials
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Questions and Answers

What is the primary reason why drinking cold water cools you down?

  • It is in a liquid state
  • It has low thermal conductivity
  • It absorbs thermal energy from the body
  • It has high heat capacity (correct)

    • What happens to the energy that is lost to friction in machines?

  • It is stored as potential energy
  • It is used to perform work
  • It is converted into kinetic energy
  • It is wasted as thermal energy (correct)

    • What is one way that thermal energy is used in industry?

  • To power cars
  • To cut stone
  • To generate electricity
  • To make metals harder and more brittle (correct)

    • Why does friction cause machines to break over time?

    <p>Because it causes thermal energy to be wasted</p> Signup and view all the answers

    What is the purpose of infrared cameras in night-vision goggles?

    <p>To view objects without visible light</p> Signup and view all the answers

    What happens to energy when it changes form or performs work?

    <p>It is wasted as thermal energy</p> Signup and view all the answers

    Which material from the table would be the best thermal insulator?

    <p>Oak wood</p> Signup and view all the answers

    Why do solids have higher thermal conductivity than liquids and gases?

    <p>Because particles are closer together</p> Signup and view all the answers

    What is the main reason why water has a high heat capacity?

    <p>Because water molecules are strongly attracted to one another</p> Signup and view all the answers

    What would be the best material for building a fireplace?

    <p>Material with low heat capacity</p> Signup and view all the answers

    Why does animal fur make a good insulator?

    <p>Because it traps air within it</p> Signup and view all the answers

    What would happen if you recorded the temperatures of water and sand in separate cups?

    <p>The sand would heat up faster than the water</p> Signup and view all the answers

    How does thermal energy travel through radiation?

    <p>At the speed of light</p> Signup and view all the answers

    What is the primary reason conduction is slower than radiation and convection?

    <p>Thermal energy must move through all particles in between</p> Signup and view all the answers

    Which of the following is a characteristic of a good thermal conductor?

    <p>It conducts energy easily</p> Signup and view all the answers

    What is the speed of thermal energy transfer through convection currents?

    <p>56 m/s</p> Signup and view all the answers

    What is the term for the ability of a material to transfer thermal energy?

    <p>Thermal conductivity</p> Signup and view all the answers

    What is the primary difference between conduction and convection?

    <p>Method of energy transfer</p> Signup and view all the answers

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