A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure. It absorbs, 40 J of heat during the part AB, no heat during BC and rejects 60 J of heat during CA. A work of 50 J is done on the during the part BC. The internal energy of the gas at A is 1560 J. The work done by the gas during the part CA is:
A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure. It absorbs, 40 J of heat during the part AB, no heat during BC and rejects 60 J of heat during CA. A work of 50 J is done on the during the part BC. The internal energy of the gas at A is 1560 J. The work done by the gas during the part CA is:
Option 1 -
20 J
Option 2 -
30 J
Option 3 -
-30 J
Option 4 -
-60J
-
1 Answer
-
Correct Option - 2
Detailed Solution:Given
QAB = +40J
QBC = 0J
QCA = -60J
WCA =?
WBC = -50J (on the gas)
UA = 1560J
1st Law on path A to B
WAB +
Þ 0 +
Þ UB = UA + 40
= 1560 + 40
UB = 1600 J
1st Low
...more
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From first law of thermodynamics
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