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In figure, a sample of an ideal gas is taken through the cyclic process abca. `800J` of work is done by the gas during process ab. If gas absorb no heat in process ab, rejects `100J` of heat during bc and absord `500J` of heat during process `ca`. Then (a) find the internal energy of the gas at `b` and `c` if its is `1000J` at a (b). Also calculate the work by the gas during the part `bc`, |
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Answer» (a) In process ab `DeltaQ = DeltaU +W` `Q = U_(B) - 100 +800` `U_(B) = 200J` for Cyclic process `DeltaQ = DeltaU +W` `400 = 0 +800 +W_(BC)` `W_(BC) =- 400 J` for process bc `DeltaQ = DeltaU +W` `- 100 =- 400 +U_(c) - 200 :. U_(c) = 500J` |
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