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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A poker is a stiff, nonflammable rod used to push burning logs around in a fireplace. Suppose it is to be made of a single material. For best functionality and safety, should the poker be made from a material with (a) high specific heat and high thermal conductivity, (b) low specific heat and low thermal conductivity, (c) low specific heat and high thermal conductivity, (d) high specific heat and low thermal conductivity, or (e) low specific heat and low density?

To determine
The nature of the material of the poker rod.

Explanation

Given Info:

Materials with larger specific heat will require more energy to raise its temperature where as materials with smaller specific heat will require less energy to raise its temperature.

Materials with larger thermal conductivity conduct heat quickly where as materials with smaller thermal conductivity do not conduct heat quickly.

Conclusion:

To push the burning logs around in a fireplace, the poker must withstand larger temperature and does not get hot quickly. Therefore, the materials used must have high specific heat and low thermal conductivity. Thus, option (d) is correct.

If the material is of high thermal conductivity, the material quickly conducts the heat and it gets hotter...

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