1. Ethane, initially at 35 kPa with a volume of 0.12 m³, is compressed frictionlessly in a cylinder until its volume is halved in such a manner that its pressure and volume are linearly related, p = a+bV. The final pressure is 80 kPa, and the change in internal energy of the ethane is 3.22 kJ. Determine the heat transfer. [Ans: -0.23 kJ]

Elements Of Electromagnetics
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First Law of Thermodynamics Conservation of Energy - Closed Systems.
1. Ethane, initially at 35 kPa with a volume of 0.12 m3, is compressed frictionlessly in a cylinder until its volume
is halved in such a manner that its pressure and volume are linearly related, p = a+bV. The final pressure is
80 kPa, and the change in internal energy of the ethane is 3.22 kJ. Determine the heat transfer.
[Ans: –0.23 kJ]
2. A closed system contains 30g of a gas. How much heat (in Joules) is added to or rejected by the system to
produce 5000 N-m of work while the stored energy decreases by 200 J/g?
Transcribed Image Text:First Law of Thermodynamics Conservation of Energy - Closed Systems. 1. Ethane, initially at 35 kPa with a volume of 0.12 m3, is compressed frictionlessly in a cylinder until its volume is halved in such a manner that its pressure and volume are linearly related, p = a+bV. The final pressure is 80 kPa, and the change in internal energy of the ethane is 3.22 kJ. Determine the heat transfer. [Ans: –0.23 kJ] 2. A closed system contains 30g of a gas. How much heat (in Joules) is added to or rejected by the system to produce 5000 N-m of work while the stored energy decreases by 200 J/g?
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