question form

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PHY 202

Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

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Textbook Problems Pt 2

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For the assignments in Query 2, particularly regarding problem 13.12:

Problem

Question: query general phy 13.12: what is the coefficient of volume expansion for quartz, and by how much does the volume change? (Note that Principles of Physics and University Physics students do not do General Physics problems)

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Your Solution:

Coefficient of volume expansion for quartz = 1*10^-6

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Given Solution:

** The coefficient of volume expansion for quartz is 1 x 10^(-6) C^(-1).

The sphere has diameter 8.75 cm, so its volume is 4/3 pi r^3 = 4/3 pi ( 4.38 cm)^3 = 352 cm^3, approx..

The coefficient of volume expansion is the proportionality constant beta in the relationship `dV = beta * V0 * `dT (completely analogous to the concept of a coefficient of linear expansion).

We therefore have

`dV = beta* V0*dT = 3 x 10^(-6) C^ (-1) * 352 cm^3 * (200C - 30 C) = 0.06 cm^3 **

Self-Critique:

I am at a total loss as to where the sphere diameter in your solution came from. I found myself unable to answer the second part of the question because I know where to find the information for initial volume or temperature change.

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Self-Critique Rating:

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The full statement of the problem is in the text.

I can't completely quote the text in these documents, due to copyright laws. So the statements you see here are abbreviated statements, meant for reference only.

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I looked in my textbook and my #13.12 is entirely different than the one you are referencing. I have the sixth edition of Physics by Giancoli, which you had stated would be okay for the course. Am I looking in the wrong place or are you referencing the newer edition?

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I'm referencing the sixth edition, which I have in my hand.

Problem 13.12 is at the bottom of the first column of problems at the end of the chapter, and it does reference the quartz sphere.

What is the nature of problem 13.12 in your text?

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My mistake... I was looking at the problems within the text of the chapter, rather than at the problems at the very end of the chapter. Thank you for the clarification - I was so worried!

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That had me a little worried, too. I wasn't sure what the publisher might have been up to.

I'm glad we resolved it.

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