hw_6 - ME 125NT Intro to Nanotechnology Due: 5/15/2008 1...

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Unformatted text preview: ME 125NT Intro to Nanotechnology Due: 5/15/2008 1 Problem Set 6 Problem 7.4 in book A free electron in a block of gold has an energy of 3.810-21 J. What is the approximate temperature (C) of the block? Problem 7.10 in book A copper wire 3 m in diameter and 300 m long has a temperature at one end of 35C and 32C at the other. Calculate the rate of heat flow though the wire, in watts. (For copper k c =400 Wm-1 K-1 .) Problem 7.11 in book The thermal conductivity of air at room temperature is 0.028 Wm-1 K-1 and its density is 1.16 kg/m 3 . The average air molecule travels at 524 m/s and collides about every 267 picoseconds with another air molecule. How much heat (in joules) is needed to raise the temperature of a cubic meter of air by 10C? Problem 7.12 in book Very thin films are usually deposited under vacuum conditions to prevent contamination and ensure that atoms can fly directly from the source to the depositing surface without being scattered along the way....
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This note was uploaded on 08/06/2008 for the course ME 125 taught by Professor Pennathur during the Spring '08 term at UCSB.

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hw_6 - ME 125NT Intro to Nanotechnology Due: 5/15/2008 1...

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