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Topic: The ^E ?  (Read 7715 times)

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Tom

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The ^E ?
« on: June 29, 2004, 12:34:21 PM »
A system was found to absorb 500.0 J of heat from the surroundings and did 25.0 J of work on the surroundings.  Is the ^E for the surroundings 525 J?
   
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Offline Donaldson Tan

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Re:The ^E ?
« Reply #1 on: June 29, 2004, 03:03:59 PM »
what does ^E refer to? I'm not sure of your notation. All I know is:

change in energy of system = change in energy of surroundings (1st law)
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Tom

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Re:The ^E ?
« Reply #2 on: June 29, 2004, 03:43:16 PM »
The ^ is suppose to be a triangle or represent "delta"
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Offline Mitch

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Re:The ^E ?
« Reply #3 on: June 29, 2004, 03:54:04 PM »
I would of suspected 475J.
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Offline Donaldson Tan

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Re:The ^E ?
« Reply #4 on: June 29, 2004, 05:30:31 PM »
Quote from: Mitch on June 29, 2004, 03:54:04 PM
I would of suspected 475J.

dQ = dU + W

500 = dU + 25

dU = +475

With reference to first law, ie;. change in energy of system = change in energy of surroundings, ^E for the surroundings is thus +475 too.



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"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Tom

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Re:The ^E ?
« Reply #5 on: June 30, 2004, 08:36:18 AM »
Thanks, I unerstand were I fouled up! I appreciate your assistnce in checking my answer.
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