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Naol
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The actual efficiency is 40% of maximum theoretical efficiency w/c is [1-(373K/973K)]=0.62. Actual efficiency =0.62*40% => 24.8% now we can find the heat of the reservoir! 0.248=5000J/Qh Qh =5000J/0.248 QH =20161.3J The energy required to extracted from