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Physics: Thermodynamics

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PurpleSkier
Posts: 5634 - Karma: 311
So i have this problem i cant figure out, and i know its basic, but i'm having a brain lapse, its on a test that i have to finish, so i need the correct answer, which ends up in the range of 30 some degrees Celcius. Problem is as follows:

5grams of steam with a temperature of 245 degrees Farenheit(118.333 C) is bubbled down to a temperature of 100 C. its then mixed with 100grams of water at 20 C. What is the final temperature?

Little help?

Dogs fucked the pope, no fault of mine - HST

May 4 2005 6:02PM
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PurpleSkier
Posts: 5634 - Karma: 311
The answer is supposed to be in the 40's that was my typo. sorry


Dogs fucked the pope, no fault of mine - HST

May 4 2005 6:13PM
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Snubluck
Posts: 2192 - Karma: 11
Does it talk about the number of moles? Because then you could use pV=nRT but I think that problem is a diffusion problem. I'm not very good at thermo though.

-at least you went down naked- 'If brain power was gas you couldn't power a toy motorcycle around a penny.' Phrosty
May 4 2005 7:11PM
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Jenna1106
Posts: 3012 - Karma: 10
no dont use that thats for chem...use to phase change and temperature change formulas...i cant remember them but if thats what you're learning you should know them

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high north session 3!!
May 4 2005 8:39PM
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SkierJulie
Posts: 2495 - Karma: 101
the total heat energy is the same

5 *245 = initial heat, then it loses the amount of heat in (5 * 100)

and then the specific heat of water * 100 (grams) * 20 has to equal the heat lost when you change the steam from 245 to 100

so we'll call SHS (specific heat of steam)

SHS * 245 * 5 - SHS * 5 * 100= SHS * 20 * 100 + SHS * 5 * temp (which you wanna find)

you gotta look up the SHS b/c it's a given value

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~ J u L i E ~

Yankees '05

Now that I have Citizen Kane and The Godfather, I can officially call Major League the best movie ever!
May 4 2005 8:40PM
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skisebski
Posts: 5970 - Karma: 21
conversion from c to f again please?

*NS Skateboarders*

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May 4 2005 8:51PM
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SkierJulie
Posts: 2495 - Karma: 101
(5/9)*(deg F-32)

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~ J u L i E ~

Yankees '05

Now that I have Citizen Kane and The Godfather, I can officially call Major League the best movie ever!
May 4 2005 9:09PM
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Snubluck
Posts: 2192 - Karma: 11
You must not be in AP Physics or in a college thermo class.

-at least you went down naked- 'If brain power was gas you couldn't power a toy motorcycle around a penny.' Phrosty
May 4 2005 9:56PM
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Snubluck
Posts: 2192 - Karma: 11
is that using like Q=mc(specific heat)DeltaT? Or what? I'm sorry, my thermo isn't very up to date.

-at least you went down naked- 'If brain power was gas you couldn't power a toy motorcycle around a penny.' Phrosty
May 4 2005 9:58PM
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SkierJulie
Posts: 2495 - Karma: 101
yea it's q = mc deltaT

--------------
~ J u L i E ~

Yankees '05

Now that I have Citizen Kane and The Godfather, I can officially call Major League the best movie ever!
May 4 2005 10:01PM
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SkierJulie
Posts: 2495 - Karma: 101
i think that's wut ur supposed to use... but, i havent taken physics in two years

--------------
~ J u L i E ~

Yankees '05

Now that I have Citizen Kane and The Godfather, I can officially call Major League the best movie ever!
May 4 2005 10:08PM
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PurpleSkier
Posts: 5634 - Karma: 311
yeah, its Q=mass*specific heat*delta Temp

i figured it out, its like 45.2157 Degrees C

C=specific heat
T=temp
H=specific heat of vaporization

its Temp Final = (m*C*deltaT+m*H+(mass2*C*T))/(m*C+m*C)

so it comes to be:

Temp Final=((5g*2020J/kg*18.3)+(5g*2.26*10^6)+(100g*4180J/kg*20))/((5g*4180J/kg)+(5g*4180J/kg))

Grams, Joules/Kilogram all cancel, leaving you with the Celcius degrees of 45.2157 C Degrees

Dogs fucked the pope, no fault of mine - HST

May 4 2005 10:26PM
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skierdudeguy
Posts: 6574 - Karma: 81
specific heat is Cp, not sh. sorry, but thats like the only thing i know about thermodynamics, short of the first and second laws, and a really basic understanding, so i jsut thought id chime in.

does any1 no the name of the song that goes WHOOHO! dunananna WHOOHO!skierdude11 please... that is not a question... it is a quote. i know the song. and no, most of you have it wrong anyway.
May 4 2005 10:48PM
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sim
Posts: 1399 - Karma: -6
If you have all your thermo tables you don't need Cp because it is merely an approximation (as it changes) unless you do its integration, as Cp= dh/dt, but I think you might not be doing that stuff at this point. It's funny though because I probably couldnt even do this question and I just wrote a final on this shit a week ago. Hmmm, haven't got my mark back yet.

signatures are for pussies
May 4 2005 11:42PM
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BigJew
Posts: 6974 - Karma: 79
I would never ask questions here involving school! (read the coke topic)


May 4 2005 11:43PM
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Anathema
Posts: 21048 - Karma: 5,061
ahahhaa. so young...


stick that in your pipe and smoke it!

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keep it real.
May 5 2005 12:59AM
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JackBach
Posts: 4155 - Karma: -5
This thread gives me hope

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May 5 2005 1:52AM
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All times are Eastern (-4)