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Linear expansion by heat for an object

  1. May 28, 2017 #1

    ehf

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    1. The problem statement, all variables and given/known data
    swYr8aw.jpg
    http://i.imgur.com/swYr8aw.jpg
    2. Relevant equations

    delta L=LalphadeltaT
    3. The attempt at a solution
    sorry for s**ty handwriting look at #8

    59Ew8vJ.jpg
    http://i.imgur.com/59Ew8vJ.jpg

    edit:click the links please. The forum software cropped the quality of the photo.
     

    Attached Files:

    Last edited: May 28, 2017
  2. jcsd
  3. May 28, 2017 #2

    haruspex

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    I cannot read the problem statement. If I blow it up large enough to be read it is just a blur.
     
  4. May 28, 2017 #3

    ehf

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    fixed problem
     
  5. May 28, 2017 #4

    haruspex

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    The linked image is hardly any better. Why not take a closer shot instead of leaving all that whitespace?
     
  6. May 28, 2017 #5

    Nidum

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    pf prob.png

    That's the best I can do with computer enhancement .

    I could not do much with the other image .
     
  7. May 28, 2017 #6

    haruspex

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    Much better. I concur with both answers.
     
  8. May 28, 2017 #7

    ehf

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    The imgur link should be just fine. I can read it on all magnification. The server cropped the displaying image whatever i did
     
  9. May 29, 2017 #8

    Nidum

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    @ehf . We understand the question now .

    This type of problem comes up frequently and once you understand one simple principle solving these problems becomes easy and usually requires little calculation .

    Consider a square plate with a round hole in it - do you think that the hole gets larger or smaller in diameter when the plate is heated ?
     
    Last edited: May 29, 2017
  10. May 29, 2017 #9

    ehf

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    smaller because of expansion @Nidum
    (i have an exam coming up so i may not access frequently...)
     
  11. May 29, 2017 #10

    haruspex

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    I must be missing something.
    My reading of the answer to a) at the link, messy as it is, is that the gap increases, which is correct.
    @Nidum's post #8 implies that at some point in @ehf's posts it is stated that the gap will shrink, but I cannot find such.
    In response to the direct question from Nidum, ehf says that a gap would shrink.
    @Nidum, what made you suspect ehf would answer wrongly?
     
  12. May 29, 2017 #11

    Nidum

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    I was working towards explaining the basic physics of expansion . In particular that gaps expand in the same way as solid metal .

    I was still having difficulty reading ehf's writing when I made that posting .
     
  13. May 29, 2017 #12

    ehf

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    my fault...it doesnt shrink anywhere...only stretches
    well please do not use the image on the thread. imgur images are almost megabytes while the images on the forum are kilobytes
    im sorry i cant convert it to text now
     
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