1. In each cycle of a cyclic process, the heat that flows through an engine will
ID: 1411015 • Letter: 1
Question
1. In each cycle of a cyclic process, the heat that flows through an engine will equal...
• The net work that the engine performs.
• The net work that the engine performs times the thermal energy.
• The change in internal energy of the engine.
• The net work that the engine performs divided by the thermal efficiency.
2. During each cycle of its operation, an air conditioner transfers 930 kJ of heat from a room and outputs 1730 kJ of heat to the outdoors. What mechanical work is involved per cycle?
• 800 kJ of work performed by the air conditioner
• 2660 kJ of work performed by the air conditioner
• 800 kJ of work performed on the air conditioner
• 2660 kJ of work performed on the air conditioner
3. A 700 g quantity of an ideal gas undergoes a reversible isothermal compression at a temperature of 330K The compression reduces the volume of the gas from 0.4 m^3 initially, to 0.15 m^3 finally. The molecular mass of the gas is 38.0 g/mol. What is the entropy change for the gas, in SI units?
Explanation / Answer
2.) Work is made on the air conditioner and Heat flows from the air conditioner. Who perform this work?, the motor that comes with the air conditioner.
Answer is 800 kj performed on the air conditioner.
3.)
m = 700g, M = 38 g/mol
n = m/M
Vi = 0.40 m^3, Vf = 0.15 m^3
T = 330 K
Q = nRTln(Vf/Vi)
entropy change = Q/T = nRln(Vf/Vi) = mR/M ln(Vf/Vi) = - 150.22 J/K
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