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PV Diagrams 2
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<=
=>
For process AB above, ΔU is:
?
+
?
−
?
0
For process AB above, Q is:
?
+
?
−
?
0
For process AB above, the W on the gas is:
?
+
?
−
?
0
For process DA above, the W on the gas is:
?
+
?
−
?
0
For process DA above, Q is:
?
+
?
−
?
0
In process DA above, ΔU is:
?
+
?
−
?
0
In process AB above, ΔU is:
?
+
?
−
?
0
In process AB above, Q is:
?
+
?
−
?
0
In process AB above, the W on the gas is:
?
+
?
−
?
0
In process DA above, ΔU is:
?
+
?
−
?
0
In process DA above, Q is:
?
+
?
−
?
0
In process DA above, W by the gas is:
?
+
?
−
?
0
In process AB above, W by the gas is:
?
+
?
−
?
0
In process BC above, the W done on the system is:
?
+
?
−
?
0
In process DA above, W by the gas is:
?
+
?
−
?
0
The above graph shows the cycle of a heat engine. Which area shows the total work done by the gas as it pushes agains the piston?
?
Area I
?
Area II
?
Area I + Area II
The above graph shows the cycle of a heat engine. Which area shows the net work done by the heat engine during one cycle?
?
Area I
?
Area II
?
Area I + Area II
The above graph shows the cycle of a heat engine. Which area shows the work done by the engine to recompress the piston?
?
Area I
?
Area II
?
Area I + Area II
The above graph shows the cycle of a heat engine. Which area shows the energy lost by the heat engine during one complete cycle?
?
Area I
?
Area II
?
Area I + Area II
The above graph shows the cycle of a heat engine. If the engine were more efficiency how should CD change?
?
It should move higher (up)
?
It should move lower (down)
?
Neither would change the efficiency
How does ΔU change during one complete cycle (ABCD and back to A)?
?
ΔU = + (total energy increases)
?
ΔU = − (total energy decreases)
?
ΔU = 0 (total energy stays the same)
OK
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