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probleme fizica termodinamica

 
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spiridusu

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PostPosted: 29-01-2010, 12:58:37 Reply with quote

Am urmatoarele probleme la fizica:


1. In cursul incalzirii izocore a unui gaz cu deltaT=400K, presiunea acestuia a crescut cu 10%.Calculati temperatura gazului in starea finala.

2. Un gaz ideal aflat in conditii normale este incalzit izocor pana la 100grade celsius.Aflati presiunea finala a gazului.

3. Calculati variatia temperaturii unui gaz aflat initial in conditii normale, daca in cursul transformarii izocore a acestuia, persiunea creste de 3 ori

4. Presiunea unui gaz ideal biatomic incalzit izocor creste de n ori.Sa se afle de cate ori va creste energia cinetica de rotatie a moleculelor gazului



Raman dator pana peste cap celui care ma ajuta, + rep.
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ion.mzk

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PostPosted: 29-01-2010, 14:15:09 Reply with quote

Primele 3:
http://i45.tinypic.com/34snhwk.jpg
http://i48.tinypic.com/vd0pch.jpg

nu sunt sigur daca-s bune.
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spiridusu

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PostPosted: 29-01-2010, 14:23:52 Reply with quote

sunt ok, o intrebare de unde ai luat 11/10 la prima problema?
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ion.mzk

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PostPosted: 29-01-2010, 14:25:51 Reply with quote

Fiindca a crescut presiunea cu 10%. 100+10/100 , 11/10 cu alte cuvinte
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nr913
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PostPosted: 29-01-2010, 16:41:34 Reply with quote

1.
V1=V2
dT=400K
p2=p1+10*p1/100
p1V1=[niu]RT1
p2V1=[niu]RT2
-----------------( : )
=>p1/p2=T1/T2
p1*T2=p2*T1 |-p1T1
p1*dT=T1*dp
dp=p2-p1=11/10*p1-10/10*p1=p1/10
=>p1*dT=T1*p1/10
=>dT*10=T1
=>T1=4000K=>T2=4400K

2.
T2=373K
V1=V2
p1=10^5Pa
T1=273K
p1V1=[niu]RT1
p2V1=[niu]RT2
-----------------( : )
=>p1/p2=T1/T2
=>p1*T2=p2*T1
=>p2=p1*T2/T1
=>p2=10^5*373/272 ~= 136630,0366300...

3.
V1=V2
p1=10^5Pa
T1=273K
p2=3*p1
p1V1=[niu]RT1
p2V1=[niu]RT2
=>p1/p2=T1/T2
=>p1*T2=p2*T1
=>T2=p2*T1/p1
=>T2=3*p1*T1/p1=3*T1
dT=T2-T1=3*T1-T1=2*1=2*273=546K


La cat m-am documentat, presupun ca energia cinetica de rotatie a moleculelor este 0 (zero).
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