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P. 4365. In a container there is a sample of air at a pressure of 5.105 Pa, and at a temperature of 350 K. The air is compressed at constant pressure to 4/5 of its original volume, while a 1000 J work is done.

a) What will the temperature of the air be?

b) What is the change in the internal energy of the sample of air?

c) What is the density of the compressed air?

(4 points)

Deadline expired on 10 October 2011.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. $\displaystyle a)$ $\displaystyle T=\frac{4}{5}T_{0}=280~$K.

$\displaystyle b)$ A belső energia 2500 J-lal csökken.

$\displaystyle c)$ $\displaystyle 6{,}2~\frac{\rm kg}{\rm m^3}.$

Statistics on problem P. 4365.
 129 students sent a solution. 4 points: 64 students. 3 points: 33 students. 2 points: 14 students. 1 point: 18 students.

• Problems in Physics of KöMaL, September 2011

•  Támogatóink: Morgan Stanley