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85. For convenience, the “int” subscript for the internal energy will be omitted in this
solution. Recalling Eq. 1928, we note that
cycle
0
E
=
¦
, which gives
0.
AB
BC
CD
DE
EA
EEEE
E
→→→→→
Δ+
Δ
+
Δ=
Since a gas is involved (assumed to be ideal), then the internal energy does not change
when the temperature does not change, so
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 Spring '08
 Any
 Physics, Energy

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