COMEDK · Physics · 13. Thermodynamics
A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure below. It absorbs 60J of heat during the part AB and rejects 80 J of heat during CA . There is no heat exchanged during the process BC . A work of 40 J is done on the gas during the part BC . If the internal energy of the gas at A is 1450 J , then the work done by the gas during the part CA is:
- A 40 J
- B 20 J
- C 10 J
- D 30 J
Answer & Solution
Correct Answer
(B) 20 J
Step-by-step Solution
Detailed explanation
The process is a cycle ABCA. We are given the heat exchange \(Q\) and work done \(W\) for each part of the cycle. For process AB: \(Q_{AB} = 60\) J. Since \(W_{AB} = 0\) (as it is a vertical line on the P-V diagram, volume is constant), the change in internal energy is…
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