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First Law of Thermodynamics
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Question 1 of 5
1. Question1 pointsCategory: EASY
In a cyclic process, heat transfers are + 14.7 kJ, – 25.2 kJ, – 3.56 kJ and +31.5 kJ. What is the net work for this cyclic process?Correct
Question 2 of 5
2. Question1 pointsCategory: MODERATE
A slow chemical reaction takes place in a fluid at the constant pressure of 0.1 MPa. The fluid is surrounded by a perfect heat insulator during the reaction which begins at state 1 and ends at state 2. The insulation is then removed and 105 kJ of heat flow to the surroundings as the fluid goes to state 3. The following data are observed for the fluid at states 1, 2 and 3.
For the fluid system, calculate E2 and E3, if E1 = 0Correct
Question 3 of 5
3. Question1 pointsCategory: EASY
A domestic refrigerator is loaded with food and the door closed. During a certain period the machine consumes 1 kWh of energy and the internal energy of the system drops by 5000 kJ. Find the net heat transfer for the system.Correct
Question 4 of 5
4. Question1 pointsCategory: EASY
1.5 kg of liquid having a constant specific heat of 2.5 kJ/kg K is stirred in a well-insulated chamber causing the temperature to rise by 15°C. Find Δ E and W for the process.Correct
Question 5 of 5
5. Question1 pointsCategory: MODERATE
The properties of a certain fluid are related as follows:
u = 196 + 0.718t
pv = 0.287 (t + 273)
Where u is the specific internal energy (kJ/kg), t is in °C, p is pressure (kN/m²), and v is specific volume (m³/kg). For this fluid, find cv and cp.Correct