Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 4, Problem 6CQ
To determine

The reason for air being a good insulator.

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Wrap a piece of paper around a thick metal bar and place it in a flame. Notice that the paper will not catch fire. Can you explain this in terms of the conductivity of the metal bar? (Paper generally will not ignite until its temperature reaches about 230°C.)
A bulb delivers 45 W of radiant energy when its filament is at 1200 °C. If the temperature increases by 100 °C, what is the new rate of energy radiated by this bulb?
An object radiating energy at night is in contact with relatively warm Earth. How does conductivity affect whether or not it becomes appreciably colder than air?
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