Heat Engines 1: 40%, 28.6% 2: step 1, step 2, c = WitW2+W, 3: 3791 cycles Q1 4: 86 minutes, 183400 J, decreases 5: 28.8% In a (TH - To) 6: 6= 22.8%, 26.8% to100 TH - To) + Ta In a5: On the previous assignment, you analyzed the cycle pictured below with one important difference. On that assignment, the arrow directions were reversed so that cycle was actually a refrigerator - not a heat engine. Let's turn it into a heat engine this time. To be consistent with everything you did on the previous assignment, let the pressure at the end of step 1 be p and the volume at the end of step 1 be V. Similarly, assume that you have n moles of a monatomic ideal gas. Determine the efficiency of this engine. Note that you may use any answers you wish from the previous assignment. However, you will need to determine how to use them. P 2 3 6: The Stirling engine operates between a hot (Ty) and cold (To) reservoir as shown. The two curved paths are isotherms where the gas is at the temperature of the appropriate reser- voir. Assume that n moles of a monatomic ideal gas are used in the engine. Assume that Vi = olz where a > 1. Note that Stirling engines have been used in a variety of applications throughout history: everything from pumping water to current ideas about using them in solar technology. P 2 a: Determine the efficiency of the engine in terms of whatever variables are necessary. b: Evaluate that efficiency if T# = 373 K and To = 273 K and compare it to that of an ideal Carnot engine operating between the same two thermal reservoirs. Assume that o = 10