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Topic: What is the temperature of He corresponding to <c> = 1310m/s  (Read 3614 times)

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Offline nortorius

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What is the temperature of He corresponding to <c> = 1310m/s
« on: September 27, 2006, 03:44:13 PM »
1. A large collection of helium atoms has an average speed of 1310 m/s. What is the temperature of this gas?

Below is the steps I've taken to solve this problem using the uav formula, but I'm having trouble with units/getting the correct answer (which is 324K). If you're wondering what happened between steps #3 and #4, I just squared both sides to get rid of the root sign. Thanks in advance for any help provided.



EDIT: fixed pic
« Last Edit: October 01, 2006, 01:00:53 AM by geodome »
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Offline Yggdrasil

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Re: One final gas problem (hopefully)
« Reply #1 on: September 27, 2006, 04:22:20 PM »
Recall that one joule, J = kg m2 s-2.  In order for the kg to cancel out in the units of step #3 (the quantity in the sqrt bracket should have units of m2 s-2 K-1), your molar mass should be in units of kg/mol, not g/mol.
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Offline Borek

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Re: One final gas problem (hopefully)
« Reply #2 on: September 27, 2006, 04:38:29 PM »
What if the helium is 1K in Devar flask flying Concorde? ;)
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