Askiseis b lukeiou kateuthinsis2

Page 1

ΛΥΣΕΙΣ ΤΩΝ ΑΣΚΗΣΕΩΝ

1.

∞. ·)

n2 = 0,75 n1 P1V1 = n1 RT1 P2V1 = n2 RT1

}

⇒ P2 = 3?105 N/m2.

‚) ∞ÊÔ‡ ∆ = ÛÙ·ı ⇒ Urms = 2,5?103 m/s. B. ·) Uµ = 3 U∞ 3RTB =3 n2 ∞ → µ:

3RT∞ ⇒ ∆µ = 9∆∞ n2

V1 V = 2 ⇒V2=9V1=18?10 -3 m3 T A TB

WAB=P2 (V2-V1)=4800 J.

‚) Uµ = 3 U∞ U° =U∞ ¢Uµ° = U° - Uµ = U∞ - 3U∞= -2 U∞= -5?103 m/s.

P 2.

n=

6 R

PA

VA = 10?10-3 m3

A

T∞ = 273 + ı1 = 300 ∫ ƒ∞V∞ = nRT∞ ⇒ƒ∞= 1,8 ? 105 N/m2 A→B : T∞= ÛÙ·ı.

}

ƒ∞V ∞ = P BV B PB = 1 ƒ∞ 32

° ⇒VB=32 V∞

CP = 5 CV 3

P BV ° Á = P ∞V ∞ Á PB = 1 ƒ∞ 32 µ→° : ƒµ = ÛÙ·ı. Vµ V = ° ∆A ∆A VB= 32 V∞ V °= 8 V ∞

}

}

⇒ V° = 8 V∞

⇒T° =

T∞ 4

TA T°

O

°→A : CP = CV + R = 5R 2 Á=

B

PB

VA

VB

V


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