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Homework Help: Temperature and Kinetic Theory

  1. Jun 16, 2004 #1
    An aluminum bar has the precisely desired length when at 15°C. How much stress is required to keep it at this length if the temperature increases to

    How do I do this????? can anyone help me please.... :yuck:
  2. jcsd
  3. Jun 16, 2004 #2

    Doc Al

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    Staff: Mentor

    If no stress were applied, how much would the bar expand? (You'll need to understand the coefficient of thermal expansion.)

    Then consider how much pressure needs to be applied to compress the bar back to its original length. (You'll need to understand Young's modulus.)
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