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Phy 232
Your 'test taken' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
** test taken **
Physics 232 Test 1
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Friday, July 11, 2014
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Paul D. Camp Community College, Franklin Campus: Computer Lab and temporary Testing Center (while library is being renovated)
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electronic
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I think that I did well on most of the problems, but I worry that I continue to struggle with the more advanced aspects of the bottle-engine problems. I don't need to retake the test or anything -- I'll just have to make sure that I've solidified my understanding by the final.
Also, one of the test problems needed clarification, and I think that there was a typographical error in one:
1) The cylinder-with-hole Bernoulli/Torricelli problem didn't specify whether the cylinder was open to the atmosphere; because a cylinder is defined in other contexts (e.g., the formula for its surface area) as having the endcaps on it, I assumed that it wasn't. I would have done the problem both ways (with and without including atmospheric pressure), but I didn't have time.
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The situation you are describing corresponds to the flow experiment. The tubes form cylinders also, but a cylinder with water flowing out of it is pretty specific to that experiment.
So you appear to have made the right choice.
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2) The text of the bottle-engine problem listed the bottle's material as having a linear thermal-expansion coefficient of (86 * 10^6)/degC, which, if I correctly understand what alpha means, would indicate that when the bottle is heated by a one-degree increment it swells to 86 million times its previous size. When I answered the question, I assumed that you meant 8.6 [in keeping with standard scientific notation 'x.y'] * 10^-6 instead.
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Yes, that typo does occasionally pop up and cause a problem. Again you made the right interpretation.
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h3>@&
I believe I've received and printed the test, but the printer got locked up early today so I won't be able to grade it until Monday.
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