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A gas with inital volume of 0.02m° expands.
in a piston -cylinder assembly from 8 bar to 2
bar in a process dunng wich the relation
between pressure and volume is pt" = constant
with n= 1.2, The mass of the gas is o-25 kg. if
the Speafic internal energy of the gas decreases
by 55 KJ/ kg duning the process, determine the
heat transfer by neglecting kinetic and potential
energy effects. Present answer in kJ.

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$S o l u t i o n : - G i v e n t h a t I n i t i a l v o l u m e o f g a s (V_{1}) = 0.02 m^{3} I n i t i a l p r e s s u r e (P_{1}) = 8 b a r = 8 \times 10^{5} P a F i n a l p r e s s u r e (P_{2}) = 2 b a r = 2 \times 10^{5} P a n = 1.2 m a s s o f g a s (m) = 0.25 k g d e c r e a s e i n s p e c i f i c i n t e r n a l e n e r g y (∆ u) = 55 k J / k g$

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