# Linear expansion by heat for an object

1. May 28, 2017

### ehf

1. The problem statement, all variables and given/known data

http://i.imgur.com/swYr8aw.jpg
2. Relevant equations

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

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

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

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• ###### 59Ew8vJ.jpg
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Last edited: May 28, 2017
2. May 28, 2017

### haruspex

I cannot read the problem statement. If I blow it up large enough to be read it is just a blur.

3. May 28, 2017

### ehf

fixed problem

4. May 28, 2017

### haruspex

The linked image is hardly any better. Why not take a closer shot instead of leaving all that whitespace?

5. May 28, 2017

### Nidum

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

I could not do much with the other image .

6. May 28, 2017

### haruspex

Much better. I concur with both answers.

7. May 28, 2017

### ehf

The imgur link should be just fine. I can read it on all magnification. The server cropped the displaying image whatever i did

8. May 29, 2017

### Nidum

@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
9. May 29, 2017

### ehf

smaller because of expansion @Nidum
(i have an exam coming up so i may not access frequently...)

10. May 29, 2017

### haruspex

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.

11. May 29, 2017

### Nidum

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 .

12. May 29, 2017

### ehf

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