Piston Air
A piston/cylinder setup contains 1 kg of air at 20°C with an initial volume of V1=0.1 m3, as shown in Fig. Q7. Initially, the piston rests on some stops, but it is possible for it to move within the cylinder without friction. To lift the piston and start such motion, an air pressure of 1400 kPa is required. Now, heat is transferred to the system so that the temperature of the air reaches to a final value of 300°C.
A. Which statement is true?
The air can lift the piston before the temperature reaches to 300°C
The air cannot lift the piston before the temperature reaches to 300°C.
B. What is the final volume of the air in the previous question?
(Select the closest value)
0.1956 m3
The air does not lift the piston; so, the final volume equals the initial volume, 0.1 m3.
0.1665 m3
0.1175 m3
C. What is the absolute value of the total work done by air on the piston?
(Select the closest value)
The air does not lift the piston; so, the total work is zero.
133.8 kJ
93.1 kJ
24.5 kJ
D. What is the total heat transferred to the air to increase its temperature to 300°C?
(Select the closest value)
139.78 kJ
225.54 kJ
281.40 kJ
201.04 kJ
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