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Ajutor la fizica

 
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Lucky17

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(since 10-11-2010 13:12)
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Post Posted: 29-09-2010, 15:04:58 | Translate post to: ... (Click for more languages)

Salut tuturor,
rog mult sa-mi ajutati in rezolvarea unor probleme la fizica.. Apreciez mult munca si timpul vostru pierdut in solutionarea problemelor mele.

Problemele:
http://s002.radikal.ru/i200/1009/1b/53ea4aba8b88.jpg

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In2ition

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Post Posted: 02-10-2010, 01:44:50 | Translate post to: ... (Click for more languages)

Din ce mai tin eu minte se aplica formula
P * V = n R T

( presiune * volum = n * constanta gazelor R care este 0.082 daca mai tin eu minte bine * temperatura )
Nu mai stiu cu cine este egal n in fizica, in chimie este n= m / M


P*V= m/M * R * T
presiune, volum, masa, temperatura sunt date de probleme
R = 0,082 si M oxigen ( masa moleculara ) este 16


We stop looking for monsters under the bed when we realize they're inside of us.

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no really, dacã nu era așa țãrancã, și dacã era în bucurești, o luam de nevastã

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Allecs

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Post Posted: 31-10-2010, 01:25:53 | Translate post to: ... (Click for more languages)

1.pV=(niu)RT
In cazul tau:
p= 10^5
V= 2,24 x 10^-3
R=25/3
T=273

Calculezi (niu).
Stim ca (niu)=m/M.
M al oxigenului este 16 si ai aflat masa.

2.
Pentru ca gazul a fost incalzit la volum constant inseamna ca ai de-a face cu o transformare izocora.
Asta inseamna ca p1/T1=p2/T2.
p1=6x10^5
T1=580K
p2=6.6x10^5 (zice ca s-a marit cu 0.6 x 10^5 adica (6+0.6)x10^5)
Inmultesti mezii cu extremii si aflii T2.

3. pV=(niu)RT
V=4x10^-3
(niu)=m/M=6/16=0.37
R=25/3
T=600

Cunosti toate datele mai putin V pe care il poti calcula acum.

Nu am facut numeric, sper ca macar la asta sa te descurci.
Nu stiu daca mai ai nevoie de ele, avand in vedere ca postul era cam vechi, dar ma plictisisem si mi s-au parut interesante avand in vedere ca eu dau bacul anul asta din probleme de tipul :p. Bafta cu fizica!

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