n moles of a diatomic ideal gas go through cycle a → b → c → d → a as shown in the figure. Processes ab and cd are isothermal and occur at temperatures TH and TC, respectively.   1) Calculate the work Wab done by the gas during the process a → b in terms of the variables in the problem.  2) Calculate the work Wbc done by the gas during the process b → c.  3) Calculate the total work W done in the entire cycle in terms of the variables in the problem.  4) Calculate the total heat Q flowing into the gas in a complete cycle.

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